u should let your fresh salt water sit overnight with a heater and powerhead in the future(after this crisis)
freshly made salt water can be quite harsh to the fish/corals/tank.
The fact that your aren't doing this could be creating the problem in the first place.
I am far from being an expert on anything however and am just making suggestions.
HTH
Neal
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Way too much time and money has gone into this hobby....and yet, I CAN'T STOP
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