Who Gives A Fish Forums

Thanks for the ideas, everyone. I'll test Mg and maybe switch to kalk in the ATO. My Alk's at 9 dKH, salinity 1.025. Appreciate the help!

I've been struggling to maintain stable calcium levels for my SPS corals. My tank is a 75-gallon mixed reef with Radion XR15s, running at 80% intensity for 10 hours daily. I dose two-part but my Alk stays steady while Ca drops fast. Anyone got tips on balancing this without messing with Mg?