I had Dino and had to cut the lights out for 3 days and than used 5 hours max after that for another 2 weeks during that time my ph was kept around 8.3 to 8.4 from dosing 2 part with no water changes to starve out the Dino my calc at 420 my all 11dkh.. With the Dino all corals were doing great. At the end of all this commotion I did. 50 percent water change in my 90 gallon with a 35 gallon sump. That's when everything started to look like crap. My Xenia died during lights out. My heat was about 1 degree up from the water change. I dosed for calc and all because calk was at 400 and all was 172. the day after my blue damsel looked to have fin rot. I set up my qt tank and by the time the water was ready the fish looked healthy. My Parameters are 1.025 salinity. My phosphate is .07 my nitrite nitrate and ammonia are 0. I have been having issues keeping my protein skimmer skimming. Should I get something to test for orp? My water flow is strong and intermittent but the whole tank is suffering from the green nepthea to the mushrooms and zoas. So it's not a flow problem. Either too strong of light after lights out or a possible orp problem. I also started dosing coral vital to see if any corals cheered up which they didn't. My water is extremely clear if I had an orp problem would it be visible? Thanks for the help I really don't want to kill everything. My fish and inverts are fine.