Me and a buddy made some rock and we used a mixture of aragonite sand, crushed oyster shells and crushed coral. The crushed oyster shells are pretty much mostly calcium if I recall correctly and so is the rest of it. The rock looks really nice but isn't done curing yet. I expect it will take 4 - 6 months to be fully cured. When the rock is fully cured the PH should be fine as well.
IMO if you make rock out of just sand and cement it will not be near porous enough to really make good rock. The more porous the better for the bacteria to live, as well as the pods and other critters.
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07-21-2005, 02:07 PM
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