Our 3 1/2 year old male betta, Gorton, has a touch of fin rot on the tip of his tail. It doesn't really surprise me, his fins are really brittle and they tend to flake off, as they often do in aging bettas. He's in a 2.5 gallon tank, and he gets twice weekly water changes (one 50% and one 100%), but I think I'm going to have to throw in an extra 50. Anyways, since he's old I'm undecided as to whether adding AQ salt to his water would help him fight the rot off, or whether it would irritate him and make it worse. Any opinions??? Thanks!!!