I have a planted 55gal, stable for over a year, Amonia, nitrites 0, Nitrates less than 40, no new fish loss. Weekly 10% water changes, no overfeeding...etc... Over the last few days, my 2 bosemani rainbows have been spazing, I mean swiming in loops, jumping out of the tank, really freaking out. They get worse when I walk by the tank or turn the lights on or off. I noticed on one that he seemed to have a small piece of white material hanging off his lower lip, maybe skin...dunno, possibly an injury from raming into something... The other rainbow looks fine. Today, the one with the piece of skin off his lower lip was sitting, upsidedown, in one of the plants, 5 mins later he was swiming aroung like nothing was wrong....Any thoughts???