Okay so 2 days ago I did a water change, the next morning I checked my levels. Calcium 450, alkalinity, 8.5, salinity on the Hannah checker is 35.5 ppt. So then I did dose my fuel and acro power under recommended dosing and I dose that twice a week. Usually once a week I am dosing alkalinity, not much but a little just bringing it back to 8.5 from 8. Tank has been going for about 9 months now I do have a moderately high coral load somewhere around 30 frags and only 1 small colony. Mainly acros, a few torches and some lps and a few small zoa colonies. Well I tested my calcium today and it came out to 510. This has been a issue for quite some time I cannot keep my calcium below 500 but does not go above 560. Can someone help is there a chemical reaction am I pulling calcium out of my corals. I’m stumped thanks.