ashdavid said:I dont know much about your tank but have you tried tackling the problem at the source. There is something that is causing this fin rot and 9 times out of 10 it is water quality.What size is your tank? how much filtration do you have? I know it is difficult but have you tried 30-40% water changes every day? If I had your problem first I would try and find the source of the problem, then I would use salt and do water changes everday adding the calculated dose of salt that you have just taken out with your water change. You don't want to be adding salt on top of salt.
What should I test for in the tap water??
I was doing water changes everyday while the tanks were cycling.
I have a 10g and a 6g.
I've been treating my bettas in isolated bowls floating in the 10g to keep the temp consistant.
I've been treating them as described earlier in this post.
A guy at the LFS said to use bottled water but that just doesn't seem right to me.
I'm thinking their fins probably tore in the first place because they were present in a fishy cycle (I didn't know any better). And now this is what I have to deal with as a result.
I feel horrible. I just want them to be better...
This post describes my situation in more detail.
http://www.aquariacentral.com/forums/showthread.php?t=49766