It just cal carb from hot springs. Though its a softer stone it will not disolve in tank. So I've read. The whiter the stone the less impurities. I read several threads on reef tank of people using it without issue
Those travertine tiles you have are the tumbled stone. I wonder if the filled and honed travertine would be safe as well?
03-25-2013, 02:48 AM
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