To answer Smokinreefer's question.... I have put the rock work in the tank immediately after bonding the rocks together with the hydraulic cement and haven't noticed any negative issues with pH, alkalinity or the inhabitants, and that is with two nano tanks. (14 and 28 gallon tanks) But that is just using the cement for bonding rocks.
Most cement takes 28 days to completely cure but I never noticed anything that concerned me. I imagine there is a lot of calcium and some other ingredient in the hydraulic cement that creates the heat and the fast set time. I said cure time by mistake in my original post.
Bill
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