My zebra lion had developed a cloudy-like membrane over one eye. From my freshwater knowledge I assumed this is due to ammonia, but my ammonia is 0 and my nitrates are 10ppm. I noticed another lionfish at the shop I purchased mine from has the same condition, so maybe it was pre-existing. None of the other fish in my tank are showing any signs of illness. I heard that a treatment for this is some sort of dip? I am not sure what sort of dip to use? Any help is much appreciated.