[JWarren]

You have a situation with your water column which may be the cause of the illness. You should have no detectable ammonia or nitrites. There is an imbalance of bacteria in your system to combat the build up and your tanks equalibrium is out of whack.

I would get a bottle of Seachem Prime and add one cap full for every 50 gallons of water of your tank size. give it two hours and check your levels again. If levels are still high add another cap full wait two hours and check again. If level are still detected, do a five gallon water change with one half cap of prime. Buffer the water.

You also need to get your salt level up to at least 1.024.