Can someone please confirm whether or not this is ich? And if not, what it may be? This fish had a lighter case of this a couple of months ago, but it went away after treating with Metroplex in the food and Polyplab Medic in the water. This case looks worse and has lasted 4-5 days now. The fish still swims around and eats normally. Removing, quarantining and copper treatments are not really an option... Tank is 185 gal and no other fish have shown symptoms yet. Thanks.