Part of your issue could be a powder blue in a 60 gallon tank then need about a 160 for them to dart around, the fish could be stressed and affecting other livestock in the aquarium. Or too large for your system to handle and with minor overfeeding you n03 levels could be wacky. When we started to build our 90 gallon way back had a tiny regal tang and when he went into the 40 for holding he stress the crap out of the tank. Just a thought. It would help a lot if you were to post all your levels.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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