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I have the same problem too... my fish's dorsal tail is starting to deteriorate and it looks like a crowntail's tail ... although he isn't. I've been treatin his water w/ water changes every few days, 25%, I use a few drops of bettafix everyday 2 times a day, it started to look better or stop.... and I sort of stopped using the bettafix and it started to get worse....
also... whenever i turn off his lights, and it gets completely dark in my room at nite, in the morning he gets really pale... mayb he likes his lights... but I read somewhere that turning on the light for a long time can be stressful for bettas... hmmm?
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