Well I am a noobie to saltwater in fact my tank has nothing in it yet but here is what I figure.
One, you pH is too high (8.8) .Figure out why your pH is so high, are you using some kind of additive to raise it?
Two, dont add meds, work on water quality. Get your nitrates down, they are a factor although perhaps not the sole cause of your problem. Consider an accelerated water change schedule for the next while e.g. 20% water changes twice a week for a few weeks, this ought to get your nitrates down and settle down your pH problem as well. Consider getting someone else (fish store or hobbyist) to test your aquarium water for all parameters, could your test kits be giving false readings?
Three, look at your source water. If you are using tap water get it tested. Does it have something in it (chloramines, copper/lead, elevated pH/mineral content, etc) that could be causing problems? Also look at whether you are adding any additives/conditioners/chemicals that may be unnecessary or harmful
Fourth, consider posting some pics of the fish. Magnify the digital photos and you may see something that is not apparent to the naked eye, posting pics on this board would probably get some answers.
Anyway that is how I would start to approach the problem, lets hear from someone who's got more experience than me though, I'm still waiting to fill up my tank with salt water.
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