Megaquarium/Tanks

Critical to the aquarium's success are the various tanks that hold the fish you will be hosting. Tanks come in several different types, with smaller tanks being more accessible and easier to maintain, but larger tanks can hold larger fish.

Fish tanks can generally be increased in size by clicking and dragging during placement, up to a maximum size. It is not possible to resize fish tanks once they are placed, though fish tanks can be relocated for free at any time. Items in one tank can be moved to another.

All tanks may be painted to match the aquarium's theme.

Freestanding
Freestanding tanks can be accessed by staff from any direction, and offer unmatched visibility. This oftentimes conflicts with their relatively small size, and often requires pumps to channel water to them from the equipment that maintains them.

Basic Tank
With a standard size of 2x2 and a maximum size of 3x3, the basic tank is used only at the beginning of the game when you can't afford anything larger. That being said, they are extremely cheap and extremely visible, making it ideal for holding small fish in a well-travelled area. Guests can see the tank from all sides.

Provides 2 volume per tile.

Official Description: The Basic Tank has a low capacity and can be accessed and viewed from all sides.

Lagoon Tank
A decent balance between size and depth, the medium-sized lagoon tank is sufficient for a lot of fish species. This tank does well in wide open public areas where guests can view it from multiple angles. It can generally replace the basic tank once you've unlocked it, unless space is at a premium.

Its standard size is 3x3, and can be built to a maximum size of 5x5.

Provides 3.5 volume per tile.

Official Description: The Lagoon Tank is similar to the Basic Tank but is sunken into the floor, increasing its capacity.

U Tank
The largest freestanding tank possible, the U tank is both sunken into the floor and provides a large amount of viewing space to display larger fish. It's nowhere near as space efficient as the rounded Belfast tank, though, so it should generally be used sparingly.

Its standard size is 8x5, and can be built to a maximum size of 11x7.

Provides 3.5 volume per tile.

Official Description: The 'U' Tank is a larger version of the Lagoon Tank and is useful for filling the end of a room while the 'U' shape increases the number of viewing locations.

Wall
Wall tanks can only be accessed through three, two, or one side, but can be placed as part of a wall. Wall tanks can be much larger than freestanding tanks. Wall tanks can ideally fit in as part of a wall, with pumps and heaters out of sight on the opposite side.

Wall Tank
Intended to be integrated with walls on either side, the wall tank quickly becomes a replacement for the freestanding tanks after leveling up. This tank can only be viewed from one side, so standard usage of this tank will have equipment behind the wall and opposite the viewing angle, to prevent guests from seeing the filters and heaters maintaining the tank. Guests that see this equipment will deduct prestige.

This wall tank is notably more efficient than the standard tank, though is not as good as deep tanks. Its smallest size is 2x2, and can be expanded during construction up to 4x3, making it one of the largest shallow tanks.

Provides 2.5 volume per tile.

Official Description: The Wall Tank has a medium capacity, one viewing side and is only accessed at the back allowing you to keep your equipment out of the way of guests.

Corner Tank
The corner tank's strategy of employment is the same as the wall tank mentioned above, though this time it can be viewed from two angles instead. It is slightly less space efficient, however, as it can only be increased in size from 2x2 to 3x3, which is less space than the standard wall tank. It is easy for newer players to assume that corner tanks and wall tanks feature the same capacity, and end up overcrowding these tanks as a result.

Provides 2.5 volume per tile.

Official Description: The Corner Tank has a medium capacity, has two viewing sides and is only accessed at the back allowing you to keep your equipment out of the way of guests.

Observer Tank
The three-sided observer tank is the largest of the shallow tanks. It can be used similarly to the wall tank to capitalize on its three viewing sides, and should be able to hold small to medium sized fish.

Its standard size is 2x3, and can be expanded during construction to 3x4.

Provides 2.5 volume per tile.

Official Description: The Observer Tank has a medium capacity, has three viewing sides and is only accessed at the back allowing you to keep your equipment out of the way of guests.

Deep Wall
Deep Wall tanks are functionally the same as wall tanks, but have a depth of 2 instead of 1. These tanks require a platform in order for staff to feed the residents, and are naturally much larger and thus can be more difficult to fit in. These tanks will be the backbone of most of your mid to endgame tanks.

Deep Wall Tank
A larger version of the standard wall tank, designed to house medium-sized fish. This tank should be the mainstay of the aquarium, hosting most forms of fish. Follow the same tactics as the standard wall tank, while keeping in mind its larger minimum size makes it harder to fit into tight spaces.

A raised platform with stairs are required for staff to feed the fish in this tank. Staff and customers can walk over stairs, and customers will not complain if they see the feeding platform. Stairs do not block the way for staff or customers, and can be walked horizontally across.

Its maximum size is 3x2, and can be increased to 7x4.

Provides 4 volume per tile.

Official Description: The Deep Wall Tank has a high capacity, one viewing side and is only accessed at the back allowing you to keep your equipment out of the way of guests.

Deep Corner Tank
A larger version of the corner tank, designed to house medium-sized fish. This tank should be the mainstay of your aquarium, hosting most forms of fish. Follow the same tactics as the standard corner tank, while keeping in mind its larger minimum size makes it harder to fit into tight spaces.

A raised platform with stairs are required for staff to feed the fish in this tank. Staff and customers can walk over stairs, and customers will not complain if they see the feeding platform. Stairs do not block the way for staff or customers, and can be walked horizontally across.

Its maximum size is 3x3, and can be increased to 5x5.

Provides 4 volume per tile.

This tank is unlocked at the same time the Deep Wall tank is.

Official Description: The Deep Corner Tank has a high capacity, has two viewing sides and is only accessed at the back allowing you to keep your equipment out of the way of guests.

Deep Observer Tank
A larger version of the observer tank, designed to house medium-sized fish. This tank should be the mainstay of your aquarium, hosting most forms of fish. Follow the same tactics as the standard observer tank, while keeping in mind its larger minimum size makes it harder to fit into tight spaces.

A raised platform with stairs are required for staff to feed the fish in this tank. Staff and customers can walk over stairs, and customers will not complain if they see the feeding platform. Stairs do not block the way for staff or customers, and can be walked horizontally across.

Its maximum size is 3x3, and can be increased to 5x6.

Provides 4 volume per tile.

This tank is unlocked at the same time the Deep Wall tank is.

Official Description: The Deep Observer Tank has a high capacity, has three viewing sides and is only accessed at the back allowing you to keep your equipment out of the way of guests.

Deep Outcrop Tank
An exceptionally long tank with extremely odd dimensions. This tank functions similarly to the deep observer tank, but is extremely skinny. It otherwise functions similarly to the other deep tanks, including requiring a platform with stairs in order to feed the fish inside.

Its standard size is 2x7, and can be increased to 2x11.

Provides 4 volume per tile.

This tank must be researched separately from the other "deep" tanks in its category.

Official Description: The Deep Outcrop Tank is useful in situations where you want some tanks down the middle of a room but don't have the width available for regular wall tanks.

Large
Large tanks are the biggest in the game, and can hold all but the largest animals.

Belfast Tank
The stereotypical "shark tank", the Belfast tank is one of the first tanks you'll acquire with the rounded edges trait. This trait is necessary for maintaining a lot of the fast-moving shark species, which do not tolerate corners in their tanks.

Even disregarding this trait, however, the Belfast tank is one of the largest and straightforward tanks to maintain, and so can be used to house medium or large fish of most types. Its large size also makes it excellent for shoaling fish, which require the company of their kin to stay healthy.

The Belfast tank sets a new standard for height when unlocked, requiring a platform height of two stairs in order for staff to feed its residents. It otherwise, however, behaves very similarly to a deep observer tank.

The smallest Belfast tank buildable is 3x6, and the largest is 5x9.

Provides 5 volume per tile.

Official Description: The 'Belfast' Tank has a very high capacity, curved windows, and viewing on all sides.

Small Tunnel Tank
The Small Tunnel Tank operates very similarly to the Belfast tank as above. It has the same height, feeding location, and can be viewed from three sides like the Belfast. While being slightly smaller than the Belfast, this tank uniquely contains a tunnel. Every time a guest walks into the tunnel for the first time, 5 prestige is gained.

Aside from this bonus prestige, however, the two tanks are remarkably similar. Despite the sharp corners near the back of the tank, it still counts as a rounded tank for sharks and other animals that require rounded edges.

The smallest small tunnel tank is 3x5, and the largest is 5x9.

Provides 6 volume per tile. Official Description: The Small Tunnel Tank allows your guests to get right inside the tank leading to greater levels of satisfaction.

Large Tunnel Tank
The large tunnel tank is surrounded on both sides by feeding platforms, creating an actual tunnel that guests can walk through. Chaining these together can create the appearance of an underwater tunnel, with fish on all sides.

The feeding height of the large tunnel tank is 3 units, requiring a rather lengthy staircase to reach the feeding platform.

The smallest large tunnel tank is 3x11, and can be expanded on construction to 9x11.

Provides 6 volume per tile.

Official Description: The Large Tunnel Tank is great for dividing two areas while giving a new perspective to your Guests.

Chicago Tank
One of the largest tanks in the game, the Chicago tank appears more like a corner tank. Like the preceding tanks, it is also rounded, allowing for sharks and other animals to be satisfied.

It is also sunken into the ground, giving it a height of only 2. This lowers the staircase requirement for the tank's feeding platform.

Its smallest size is 7x7, and its largest is 9x9.

Provides 6 volume per tile.

Official Description: ''The 'Chicago' Tank is a high capacity round-edged tank arranged in a corner configuration. It comes in two variants, depending on whether you want the viewing edge to be on the inside or outside edge of the corner.''

Chicago Tank Internal
One of the largest tanks in the game, the Chicago tank appears more like a corner tank. Like the preceding tanks, it is also rounded, allowing for sharks and other animals to be satisfied.

The only difference between the normal Chicago tank and the Internal version is where the feeding platforms can be placed - on the inside of the corner, or on the outside.

It is also sunken into the ground, giving it a height of only 2. This lowers the staircase requirement for the tank's feeding platform.

Its smallest size is 7x7, and its largest is 9x9.

Provides 6 volume per tile.

Official Description: ''The 'Chicago' Tank is a high capacity round-edged tank arranged in a corner configuration. This variant comes with the viewing edge on the inside of the corner.''

Mega Tank
The largest tank in the game, capable of holding any fish - including the largest fish in the world, the whale shark. Acquiring this tank and getting the whale shark is the core of the final mission of the base game.

Its minimum size is 8x8, with this massive tank able to balloon to 20x20 at its maximum.

Has a height of 3 units, requiring a fairly long staircase to reach the feeding platform.

Provides 7 volume per tile.

Official Description: The Mega Tank is made from Titanium Alloy and advanced polymers to give it the strength to hold a vast volume of water.

Specialty Tank
The Kriesel Tank is specific to jellyfish.

Kriesel Tank
This unremarkable aquarium is the only one of its type. It has a circulating current that jellyfish require. Jellyfish oftentimes cannot be housed with standard fish anyway, making the Kriesel tank exclusive to jellyfish.

The Kriesel tank can be used to contain other fish, but it also cannot support any decorations, making it unsuitable for fish that demand greenery, rocks, or caves. It also lacks a substrate, and cannot have custom substrate applied to it.

It is otherwise an unremarkable aquarium that requires a single staircase to reach its platform.

The smallest Kriesel tank that can be built is 3x2, and the largest is 4x4.

Provides 4 volume per tile.

Official Description: A Kreisel Tank has a circular current which stops the animals inside from bouncing off the sides.

Beach Tanks
Beach tanks require the Freshwater Frenzy DLC and simulate a beach environment. Some animals require land in order to thrive, and these tanks have a mix of both land and water. Fish can be stored in beach tanks as well. In general, the animals that require land are tropical freshwater animals.

The size of each tank does not affect the amount of land each tank has, it only affects the aquarium capacity.

Small Beach Tank
Identical in size to the Deep Wall Tank (with a minimum size of 5x4 and a maximum size of 7x4), but has one side raised as land. Like the deep wall tank, it requires a platform to be reached and also has a single viewing side, making it work in much the same way.

However, the beach tank has less than half of the capacity of the deep wall tank.

Provides 2.5 volume per tile.

Medium Beach Tank
Only slightly smaller than the belfast tank, but has less than half the capacity. Like the belfast, it can be observed from three sides, with the fourth side being for platforms. The size of the

Its largest size is 10x6, and its smallest size is 8x5.

Provides 2.5 volume per tile.

Island Beach Tank
A medium sized tank and the largest land tank available. It is notably larger than the chicago type tanks, but is incomparable to the mega tank. It has three viewing angles and can even be observed slightly from the rear, similar to the belfast and mega tanks.

Its smallest available size is 10x10, and its largest is 12x12.

Provides 2.5 volume per tile.

Platform Tanks
Platform tanks require the Freshwater Frenzy DLC and consist of new aquarium types with pathways and platforms above them.

Feeding Platform Tank
A larger, rounded version of the jetty tank that comes with a feeding platform above it. This platform has the highest prestige gain of any tank, including that of the tunnel tanks.

As it comes with its own feeding platform, it is not necessary to build a platform for this tank. It does, however, require two stairs leading up to the platform to be reached, unlike the jetty tank.

Its largest possible size is 8x8, and its smallest is 4x6. This makes it roughly equivalent to the chicago tank in size, though this tank is square.

Provides 5 volume per tile.

Jetty Tank
A smaller version of the feeding tank. This version lacks rounded corners, but does have its own feeding platform that guests and staff can access with built-in stairs.

Its largest possible size is 7x7, and its smallest is 3x6. This makes it in between a large belfast tank and a large deep observer tank in size.

Provides 5 volume per tile.

Bridge Tank
Designed to connect two distinct parts of the aquarium, the bridge tank features, as its name suggests, a bridge spanning its length. This bridge comes with its own stairs. It can be viewed from all angles, including directly above, making it similar to the freestanding U-tank with an added bridge over it.

Its largest size is 5x11, and its smallest size 3x6.

Provides 5 volume per tile.

Viewing Platform Tank
An extremely large platform tank with a U-bend bridge spanning it, allowing guests to walk over it and then turn around. It can be treated as a U-bend version of the feeding platform tank, though this version comes with its own stairs.

Its largest size is 9x13, and its smallest dimensions are 6x10.

Provides 5 volume per tile.

Polar Domes
Polar domes require the Deep Freeze DLC and may host arctic and antarctic animals. In addition to containing space for fish, these domes also feature perches for birds such as the snow petrel and the atlantic puffin. If there is sufficient air conditioning attached to the tank, ice can form in it. This ice is a necessity for certain animals.

Small Polar Dome
Small polar domes are a good way to get started with Deep Freeze content. With four perching spots they'll be pretty standard until you unlock the medium dome with a greater size.

Provides 3 air volume per tile and 4 volume per tile. Its smallest size is 5x5, and and can be increased to 6x6.

Medium Polar Dome
The medium sized polar dome is similar and can probably replace your small polar domes for other animals. It has a height of 2, requiring two stairs to reach the platform.

Its smallest size is 10x7, and can be increased to 11x9.

Provides 3 air volume per tile, and 5 volume per tile.

Large Polar Dome
The large polar dome is notable for having almost no perches, making it unable to host birds that require them. It is generally better at holding seals and sealions.

Provides 3 air volume per tile, and 5 volume per tile.

Its smallest size is 11x7, and the largest 12x9.

Mega Polar Dome
3 air vol per tile 5 vol per tile 2 height base size 19x10 min size 17x8

Abyssal Tanks
Abyssal tanks require the Deep Freeze DLC and host abyssal creatures. They all consume science points in order to run. All abyssal tanks except the vertical abyssal tank are rounded, and none of them have a customizable substrate.

Small Abyssal Tank
base size 5x3 min size 3x3 4 vol per tile consumes 1 science per vol

Vertical Abyssal Tank
base size 5x4 min size 3x2 7 vol per tile consumes 1.5 sci per vol

Large Abyssal Tank
min size 10x7 min size 7x4 5.5 vol per tile consumes 2 science per vol

Mega Abyssal Tank
base size 9x10 min size 7x8 7 vol per tile 2.5 science per vol