Ok heres my situation, a few months ago I got my first fish. My friend moved out of his house and need to get rid of his aquarium so I told him that I would take it for him, I dont think he knew much about fish care and the tank had been negletid for quite awhile and the fish had been housed with speices that it shouldnt have been with. Since Ive had it ive been doing as much research as possible and doing the best i can to take care of it. The fish is in what I think is a 20 gallon aquarium, its got a 30 gph whisper filter, Ive been doing water changes twice a week, of about 2 gallons at a time and vaccuuming gravel, ive been trying to give it a varied diet of flakes and green vegetables like peas and lettice. Within the past few days ive noticed a small red spot on the tip of its tail, is it some kind of an infection? The fish has been acting normal, i havent seen any signs of stress and its eating normal. Since ive noticed it ive been doing more water changes and the color of the red has seemed to dull down a bit... My question is is this a disease? is it possible fin rot? Am I on the right track with more changes? As ive said this is my first fish and i would like to think ive given it a much better life then it once had, what is my next step???
thanks so much for the help