ok ive got a betta whos losing his back fin

Lotus

Ultimate Fish
Moderator
Aug 26, 2003
15,115
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Southern California
home.earthlink.net
#4
Do a large water change and make sure the water temperature is good. It does sound like fin rot. Clean, warm water (78-79F) is the best way to prevent fin rot. A little BettaFix or half dose of Melafix will help healing, but the water quality needs to be good first. :)