I noticed lately that my juvenile turquoise severum is sort of swimming abnormally and at times rubs up against objects in the tank (flower pots, plants, etc.)...not constantly but every once in awhile. I know the visual aspects of ich with the white spots, but they are not present right now (at least that I can tell). Is it safe to say it is in its early stages? Would it be wise to treat the entire 55 gallon tank for ich or will this harm the healthy fish? If so, what treatment would you recommend?