A few month ago Guppy (that is the name of my Betta) had taken up fin biting. It took me a long time to figure out what was causing it and even what it was. I caught him red finned one day, in the act. The problem has been repaired and his tail is growing back. no more trouble... I think.
I am noticing that the parts that are growing back are coming in dark and iridescent. It does not seem to bother him, but I want to get your opinion if you think this is something I should be worried about.
I change the water every 3rd day, 50% as I have a lot of plants, heater and filter. The lights do stay on all day but they are not very bright, and dark lights was the reason this started in the first place - what can I say, he likes to be in the limelight. LOL
Anyway, here is photo of the regrowth. Please let me know your thoughts.
and a close up of the tail: