So within the last 2-3 weeks, my calcium levels have dropped off from the 420-430 range, down to 384 in the most recent test. Alk is stable between 8.5-9, salinity at 1.025, nitrate at 5 and temp of 77f. I have a mixed reef with mostly softies and dose Tropic Marin AFR a couple times a week to keep my alk stable at 8.5-9. Anyone know what could cause this sharp calcium drop in the last few weeks, and what i could do to get it back up without spiking the alk as well? Thanks!