temp swing was a problem in my tank that made my sps not too happy. i had a steady temp of 81 for a full week and they did much better then it started to swing 3-4 degree and they lost some pe and color..so that could be your problem what kinds of fish do you keep? one might be apicker. hope you solve your problem!
good luck
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tankless atm
planning a 36" tall tank. for seahorses or boxfish.
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