This is the second Hellboy betta that I I have kept for some time, and in both cases, the fish gradually started to become more and more black. I am not really concerned, more curious. Has anyone else experienced this?
Also, I know about Jerry's tail tumor. He does too, and he is fine with it.
Photos are ordered from most recent going back to when Jerry first arrived, which was about 6 months ago.
https://www.reddit.com/gallery/1ta70dn
Posted by ATrain664