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Black lava is aquarium safe. I have not used it, but lava gets so hot that any minerals in it are locked up pretty well, cannot dissolve in water. You can also get it at rock yards, landscape stores, masonry yards and similar stores.
 

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I have it now in my betta tank. Works well and great rock for rooting plants due to the rough surface.



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this tank looks very nice.....i will have to check my local petco and see if i can find some!
Thanks!

Check [Ebay Link Removed] You'll get more for cheaper. That's where I got mine from. If you want the name of the seller send me a PM.

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