Rainbow rock

[SnailPocalypse]

So I was wondering if I could use these rocks in my tank? they look something like this except flat.

 

[Munroco]

They look like marble?

 

[flchamp89]

Cant tell from picture but may be limestone. Test them. Limestone will raise ph. Not saying you cant use them.

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[SnailPocalypse]

Ok