I concur with msjboy, the only factory made cement product that is pure enough for reef tanks is portland cement - it is made of baked limestone without the additives. Brock White sells white portland cement if your local big box stores don't carry it. I have successfully used this material for years. Just be sure to fresh water cure in the dark for 2 months, rinse it well, then switch to salt water, and after adding salt water let it sit for a week then test the PH. If the rock is raising the PH then let it cure longer before adding life to the tank.
Nice choice on cutting the rock, those flat pieces are great for stabilizing the base. Rubbing them on the driveway will grind off any ridges.
Last edited by LifeIsGreat; 07-04-2020 at 02:16 AM.
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