betta tail

I am currently taking care of the office fish which is a betta. He is not doing so well lately. He seems to be eating less and swimming less. As of late, he's got a white lump growing on his tail. It's only getting larger. I'm quite worried. He is two years old and lives in a fairly small...

Ok so this is my little PetCo Fry rescue. She's been ID'd as a female but now that she's big(ish) I'm wondering what color/tail type she might be and if anyone has a guestimate on how old she is that'd be really cool. I've had her about a month and 1 week. When I first got her she was no...

ok so a friend (I won't name names) had an argument on what tail type my betta is she keeps saying it's a round tail and I'm saying it's not can someone please help put this to rest cause she's not dropping it thank you

Guys, I'm doing a bad job at holding back tears right now. I was trying to take my betta fish out of his tank with a clear plastic cup, and I was going slow in keeping him in there and putting the cup against the tank so that I could scoop him out, but I guess I pinched his tail since he...