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Discussion Starter · #1 ·
I picked up these rocks at a local lanscape supply yard.
I'm not sure what they are or if I should use them in the tank.
From their website it seems they are either sponge rock or holey rock

Sponge rock...

Holey limestone...

Anybody know anything about this rock or where it comes from?
Would it be safe for my tank? I took them to the car wash and they had a lot of rust on them that washed, and washed, and washed. I think I got them pretty clean. And no, I didn't use any soap on them! I hope they wouldn't turn the water rusty.
I would like to use them in a iwagumi scape.
Here are the ones I found...

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