I came home today and noticed my sail fin had a few white spots like maybe 4 on his swim fins, hes acting normal. After looking more closely my RBTA has some spot on him as well ,but hes open and the fingers with spots are extended and fat as usual.I have been feeding more than normal , could this be the cause or should i be alarmed at this point ?None of my other 7 fish have any and are acting normal as can be /