How many models can be built from this set?

As a Creator 3-in-1 set, Fish Tank (31122) includes instructions for three different models built from the same 352 pieces.

Does the set include minifigures?

No, Fish Tank has no minifigures and puts the model itself at the centre.

What colours make up the aquarium?

Blue and black form the base colours, with yellow and white used as accents.

Creator 3-in-1

Fish Tank

Fish Tank is part of the Creator 3-in-1 line, packing three different buildable models into a single box of 352 pieces, with the main build showing an aquarium full of fish. With no minifigures included, the model itself takes centre stage rather than a play scene. Black and blue form the base colours, with yellow and white adding contrast.

Set number: 31122
Year: 2021
Pieces: 352
Minifigures: 0
Theme: Creator 3-in-1
Different parts: 118

What can I build with it?

View the official building instructions at LEGO® ↗

Parts list 118

As BrickLink list (XML)

Import on BrickLink: Wanted → Upload, upload the file (or paste its content), pick a Wanted List and add the parts.

Spare parts (24)

These extra parts come with the set in case one gets lost.

Alternative models

A 3-in-1 set: the official LEGO® building instructions contain three models you can build from the same parts. View the official building instructions at LEGO® ↗

Fan models by Rebrickable users that you can build (mostly) from this set’s parts. Instructions are available from the designers.

All 5 ideas at Rebrickable ↗

What can I build with it?

Description

One box, three builds

The main model shows a fish tank on its own stand, with colourful fish moving among plants and décor, a design that works well as shelf decoration. As with every Creator 3-in-1 set, instructions for two further models are included, built from the same 352 pieces without needing any extra bricks. That reusability is what makes the set interesting beyond the first build, since the collection doesn't run out after one finished model.

Blue and black with targeted contrast

Blue naturally stands in for the water, while black provides the frame and base for structure. Yellow adds small pops of colour, most likely on the fish themselves, with white filling in as a neutral surface. With 118 distinct part types across 352 pieces, the ratio of specialised elements is notably high for a set this size, which fits the range of shapes needed for water, fish and frame. The full parts list on this page breaks down exactly which pieces were used.

No minifigures, model-first design

Fish Tank skips minifigures entirely, which is typical for many Creator 3-in-1 sets built around one cohesive model rather than a role-play scene. That makes it more of a display piece for a shelf or desk than a conventional play set. For anyone who prefers models without role-play elements, this is a compact example of how much detail is possible without a single figure involved. For shelves or desks where a conventional play set wouldn't quite fit, that model-first focus is a genuine advantage.

Who it suits

With 352 pieces and three possible builds, the set offers a fair amount of building for its size, which appeals equally to frequent builders and collectors. The 118 distinct part types keep things varied enough to stay interesting across all three versions rather than just the first one. For anyone after brick-built home décor, the aquarium theme is also a distinctive alternative to the usual vehicle or building sets. It also makes a solid gift, since the three build options stretch the fun across several sessions rather than ending after one evening.

FAQ

How many models can be built from this set?: As a Creator 3-in-1 set, Fish Tank (31122) includes instructions for three different models built from the same 352 pieces.
Does the set include minifigures?: No, Fish Tank has no minifigures and puts the model itself at the centre.
What colours make up the aquarium?: Blue and black form the base colours, with yellow and white used as accents.