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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...
http://www.rhinomaterials.com/photo_gallery/23.shtml
http://www.stonequestinc.com/images/spongerockboulders.jpg

Holey limestone...
http://www.southweststonesupply.com/boulders.htm
http://www.southweststonesupply.com/images/boulders/HoleyLimestoneB601.jpg

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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If they were rusty, they're probably going to start leeching heavy metals into the water. Have you tested your gH and kH since adding those rocks?
 

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Those rocks should be fine as long as you don't want to maintain soft water.
 
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