Can You Put LEGO® In A Fish Tank?

It Is Doable But Not Highly Recommended

Putting LEGO® in a fish tank is an interesting form of LEGO® aesthetic. The little colorful bricks, combined with the serene beauty of an aquarium, does seem alluring.

But should you put ABS bricks in water?

You should take certain precautions to ensure the safety and well-being of your fishy friends. Not just for any chemical seeping, but to ensure none of your fish eat the lil’ LEGO® parts.

Let’s explore the dos and don’ts of using LEGO® decorations in a fish tank to see if this is something you should actually do!

They Can Be Used As Decorations For Fish Tanks, But You Have To Know What You Are Doing

Absolutely, you can use LEGO® bricks as decorations in a fish tank, but it’s crucial to follow some guidelines to create a safe and comfortable environment for your fish. First and foremost, make sure to sanitize the LEGO® pieces thoroughly before introducing them to the tank. At the very least, this will reduce any possible contaminants in the tank.

The Chemistry Behind LEGO® Placement In A Fish Tank

LEGO® is made of a highly durable plastic that is insanely strong called ABS, or acrylonitrile butadiene styrene. By nature, this polymer does not dissolve easily in water. Some chemists believe it can stay in water for 1,000 – 3,000 years. Salt water is more corrosive, so it can probably crack the bricks. However, I do think ABS plastic can stand the test of time in a tank.

Don’t Overcrowd Your Fish’s Space With LEGO®

When arranging the LEGO® bricks in the tank, ensure they don’t overcrowd the space. Fish need room to swim freely and explore. Overcrowded fish tanks can lead to stress, health issues, and create an environment where pathogens thrive.

You Don’t Want Fish To Get Caught In Any LEGO® Openings

Another essential consideration is the size of the fish and the openings in the smaller LEGO® pieces. Smaller fish could get stuck or trapped in the holes, leading to injury or distress. Make sure any LEGO® structure you introduce into the tank is large enough for all fish to fit through!

LEGO® Does Not Endorse The Use Of LEGO® In Fish Tanks

For your information, the LEGO® company does not endorse using pieces for this. It does not mean you can’t do it, but it should make you question why/if you should go through with it. Perhaps you can place the LEGO® pieces in a fish-tank-safe acrylic box within the tank?

It Can Be Done, But Read This Guide And Do It Safely

Incorporating LEGO® decorations could be a stellar way to make your existing tank more beautiful and fun for your under sea friends. However, make sure to do ample research and ensure your tank can support having LEGO® in it. Also, please invest in an incredible filter for your aquarium friends.

Lastly, overall, while it is possible, I would try to recommend keeping LEGO® out of your fish tank! LEGO® are dry weather friends — happy building!

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