11-18-2012, 08:24 AM
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A lot of crowntails will have white tips to their fins- it may just be his color. Has he always had this coloration? The thing that sticks out to me is that his rays seem rather thin, which could be the result of a bacterial infection, but hard water also can cause ray curling and deterioration. What is your pH? Also, how long have you had him, and has he gotten worse over time?
If his rays seem to be deteriorating or melting away, I would suspect fin rot. You can try aquarium salt, but I would not recommend melafix (bettafix is just diluted melafix) or premafix as they are antiseptics at best and can damage the labrynth organ at worst. If you feel that the aquarium salt is not working or the situation is getting severe, I would use a good broad spectrum (gram pos. and neg.) antibiotic. Make sure to treat for the entire duration of the recommended treatment, even if the symptoms disappear partway through, as this guards against antibiotic resistance. The only exception would be if the antibiotic is not working at all, in which case you would need to switch to a different treatment.
How big is the tank? If you want to avoid treating the pleco, you could always float the betta in a smaller container filled with medicated water inside the big tank (your betta will get heat without the need to go buy a separate hospital tank and heater). You'd just have to remember to do 100% water changes frequently.
Hope this helps. Good luck figuring out what is going on with your little guy!