Q: What is the purpose for putting gravel or rocks in a fish tank?

April 13, 2008 | By Karen A. | 2 answers | Expired: 2436 days ago

I have several tanks - but started wondering why we add rocks to the tanks. The only reasons I can think of is to make the habitat as close to the natural setting - or to make it look pretty.

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Apr 14, 2008

like jill says, the gravel helps to trap some of the waste and debris, but the big thing is that the gravel also holds bacteria that can be beneficial because they break down the waste and the harmful chemicals in the water. you can have a tank with no substrate, but you'll have to watch the water levels better and have a great filtration system. bare-bottom tanks are actually pretty popular among some aquarium hobbyists.

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Jill R.

Apr 13, 2008

gravel is pretty with a purpose...it also helps trap waste so everything isn't floating around. if you ever have a fish bowl without it, you will see what I mean, its really messy without gravel

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