I think it's a breakdown of the skeletal structure. It's weird because my calcium is like 500 and have purple covering everything. I do have to add about a gallon per day to top off. Just plain RO water. I use ESV Bionic part A and B from bulk reef supply. I use red sea coral pro salt. I add red sea Reef Energy A and B in low dose. I do about 15% water change every week or 10 days. Should I be mixing salt and adding to 1 gallon per day top off? Should I be adding some other chemical to specifically cover skeleton growth and repair