So not sure what is going on in my tank. My birdsnest, war coral, and favia are all receding/dying. The softies all look great, my frogspawn looks good, and the two anemones look good. I also have two gargonians that are flourishing. My temperatures only vary by about .5 degrees on any given day and all my other parameters appear to be rock solid. Nitrate and phosphate are undetectable on my API test kits and KH at 8 and has been steady there for 2+ months. I top off the tank with about 1 gallon every morning and I mix in 1 heaping tsp of Reef Builder Carbonate Alkalinity. I use a small siphon which feeds the solution into the return chamber of my sump over about 1 minute. I also add 2 oz of the BRS calcium solution daily, 20 oz of magnesium when I have run through a gallon of calcium. Changes before the receding started were an experiment with more blue light and less white which I have since reversed because my RBTA didn't like it. I have also noticed my EcoBAK is putting out a ton of biofilm, clogging my filter socks in roughly 3 days. I still have some GHA in the display and it has turned reddish around the roots, but is still holding in there. I also had a diatom outbreak for some reason about 3 weeks ago,since then I have cut my feeding amounts by about 70% and have been carefully watching food consumption. I changed out my RO filters suspecting water after the out break. I will do a WC tomorrow and am about to test my calcium levels.