Terry B it's not that i didnt like ur advice , i was just making sure if water changes was all i needed to do. in ur last post it made it more clear to me how to treat it. like using Nitrofurazone, Maracyn-Two if it gets worst. and i was not looking for an answer that i liked, i just needed more info like ur last post. and Terry do you still think this is split fin or could it be something else? like i said it used to look like a big white bubble and cottony looking, then in the last 2-3 months it started getting red where the bubbles were . now the bubbles pop and the fin riped apart. im ganna treat it like you guys said. i would like to know what this thing is called tho ,if you guys know.. thx again