I think I may have the same problems as U. At first I thought it was aefw as well but it was not. I was having rtn on my sps. Mainly targeting my millis. I stopped dosing vinegar and vodka and that seemed to have stopped the rtn. My mag was a lil low at around 1050 so I dosed it up to 1350 currently and 2 more milli colony is starting to STN. I believe these problems r caused by stressing in changes of water chemistry but not sure. Try stopping ur carbon dosing n see what happens. Also what are ur parameters at?
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