Susan987
Member
I have a 90 gallon reef and have had a happy and thriving tank for years. I recently switched out my 40 gallon sump to a 75 gallon sump and I thought it is going to be like a big water change. I added supplements coral food and my corals are dying. My pH is 7.2 (I know a little low), Kh 8, and ca is 440. Does anyone have any ideas?