| I wish I could reference more experince with whats going on to help, but I cant. Hopefully it works out, it sounds like you've put alot of effort in keeping it happy. I would document it as well as you can, and see if you can attribute whats happening to something. Test all parameters, review any changes you might have made recently.
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~David~
300+gal multitank, seagrass, mixed reef, clown anemone, refugium, and sump. | 
