I bought another betta fish a few weeks ago and have him in a 2.5 gallon fish tank. He has three plastic plants, but is otherwise alone in the tank. My first fish has had problems with a disapearing tail. He was a beautiful crowntail and then all the tips just seemed to fall off his tail. All his other fins were fine, so I didn't think it was tail/fin rot. I dosed him with melafix and it didn't really seem to be helping either way. I started up on the med again after break and his tail is actually looking a little better. Now it seems the new fish is missing the tips of his tail too. I just can't understand this! I also just noticed a small tear in the tail as well. I've been dosing him with Melafix for about a week now and the tips of his fin have turned clear, which I read means they are growing back. To me it just looks worse! He was so beautiful and I don't want his tail to look icky! Is there something other than melafix I should be dosing him with? I tried using stress coat and I condition the water using splendid betta water conditioner. I do complete water changes every week. Should I be doing something different? I just don't know why their tails get like this! I doubt they are bored and I only feed them once a day.