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Are LEGO elements safe to use in an aquarium with fish? I've never seen LEGO elements in a working fishtank.

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up vote 16 down vote accepted

The main restaurant in the LEGOLAND park in Windsor has quite a lot of LEGO creations in fishtanks. In the same park, the Sealife attraction 'Atlantis Submarine Voyage' has 50 species of sharks, rays and tropical fish that happily coexist with the LEGO models.

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Keep in mind that LEGO is safe from children saliva, which I'm willing to bet is more aggressive than fishtank water.

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Not to mention Legoland Windsor's Atlantis – Ambo100 Nov 5 '11 at 10:35
Thanks! That's the answer I was hoping for. – General Decline Nov 5 '11 at 18:45
Legolan Billand also has an underwater exhibit with Lego in it. – Grandpappy Nov 7 '11 at 15:22
Nice pic. Looks like I have a project. – General Decline Nov 26 '11 at 18:19
Even if they are safe, will they remain pristine, though, i.e. how do you keep them from turning mouldy? – Gnubie Oct 20 '13 at 11:07

LEGO bricks should be safe for fish. Avoid using small parts that they could mistake for food. You also might be cautious on the paint, but I'm sure it's still safer than the paint used on the cheap stuff you'll find at fish stores.

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On that note, you may want to settle for normal bricks, perhaps avoid the printed ones. Possibly the older ones (like the old computer screen printed slopes) are less safe than newer ones, and forget any of the stickers. – Danny Staple Nov 5 '11 at 23:29

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