My blue regal tang looks like it may be developing a case of ich. It doesn't look too bad yet but I can see a few scattered white spots on both sides of her body. My question is, will my scarlet skunk cleaner shrimp take care of this or should she be quarantined and treated or my whole tank treated? I do not have a quarantine tank and do not want to put my blue regal or any of my other fish under any unnecessary stress. They are in a 20 gallon tank, not big enough I know, this is only TEMPORARY. It's a small regal, maybe 2 or 2 and a half inches. Tank mates are a pair of clowns and a couple of chromis with cleaner shrimp a snail and hermits