So I’ve recently noticed that my corals haven’t been doing so well and haven’t been as happy as normal. My tank is a 90 gallon mixed reef with just two clowns after a wave of ich that wiped everything. Tested my calcium last night and it came out to 120ppm but my alkalinity was 7. Tested around the same time today a few hours after doing a 10% water change hoping to boost the calcium with fresh saltwater but it came out at 95ppm today and my alk at 7.5. PH was 8.2 and now it is 8.0 and my magnesium is at 1320 so it’s not low enough to be causing the instability of my calcium and alkalinity. Help?