OMG, I had a betta in my community tank that died a few weeks ago.
My plec had developed fin rot, so i treated the water with a fin rot ointment, and then i used melafix in the tank to help the fins grow back.
The next mornin my betta was lying on the bottom of the tank, not lookin 2 good, so i moved him to another tank but sadly he died after a couple of hours. I thought that I musta messed up somewhere with the fin rot ointment, I thought that maybe i had put too much in. I actually never considered that the melafix could of caused the death.