Should You Put LEGO In Your Fish Tank?

Written by: Jamie Hejna | Updated: March 24, 2023

Have you ever considered putting LEGO in your fish tank?

This unusual and fun activity can help to create an interesting environment for both you and your fish!

Adding LEGO bricks to a fish tank is becoming increasingly popular, as it not only adds color and texture but also provides shelter for the inhabitants of the aquarium.

Let’s look at some of the benefits of adding LEGO pieces to a fish tank, and how easy it is to do.

Should you put lego in your fish tank

Source: Reddit

Why Add LEGO To Your Fish Tank?

The addition of LEGO pieces can help create a natural and interesting environment for your fish.

The bright colors will add depth to their view, while the shapes and sizes of different pieces provide plenty of hiding spots, allowing your fish to explore or relax in safety.

Additionally, you can use LEGO to construct mounds or structures that replicate coral reefs, providing additional shelter and breaks from the flow of water.

How To Properly Add LEGO To Your Fish Tank

It’s surprisingly easy to introduce LEGO into your aquarium – all it takes is a few steps!

First, make sure that you choose pieces made from ABS plastic instead of PVC plastic as these are safe for aquatic life.

Then rinse off each piece with warm water and let them dry before adding them to the tank.

Finally, make sure to monitor your LEGO pieces regularly and remove any that develop signs of algae or other contaminants.


Overall, adding LEGO pieces to a fish tank is an easy and fun way to enhance the environment for your aquatic friends!

Not only will the colors add depth and visual interest, but they can also provide structure and shelter – making it an ideal activity for fish enthusiasts everywhere.

You’ll be surprised at how quickly you can transform your aquarium with just a few simple pieces of LEGO.


The 3D Japanese artwork makes an eye-catching display piece and is a great home or office decor