I had the same problems in the past. Things turned around for my Acroporas when I started running a UV while all else stayed constant and I was finally able to keep Acroporas alive and growing for about a year. Then, they started slowly dying again. My theory was that some kind of bacteria/vibrio was killing them and the UV sterilizer helped. When I neglected to change the UV bulb, the bacteria came back and I slowly lost all of my Acropora.
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