my calcium does run a bit low, i shoot for 410, but i've been hanging at 390 lately, still figuring out the load of the new tank. thanks for the info, i'll start paying a little more attention, my lighting isn't quite up to par either i must admit, i have finally gotten up to 6 t5's, from 4, so that should help, my clam and sps are already getting more color from the boost, and i think the acans will follow.