fin changing colour

I purchased a little baby betta fish at petco about a month ago and noticed she has some weird black patch on most of her ventral fin. Only one of them is colored like this, but she is acting normal and eating well. I'm not convinced it's fin rot because none of the fin is disintegrating and the...

This is Yotto my crowntail. Ive had him for a week and these are his before and after pictures. He is getting black fin tips with no curling or white spots. He does everything a happy male betta does. He lives in a 1 gal bowl, but I am buying him a 5 gal in a week. I do 25% daily and 100% weekly...

Hi I'd be grateful for suggestions - my Betta fish seem sick. Since yesterday evening I have noticed that my Betta seems to have difficulty staying afloat. He is 2 years old, quite large, very active and happy. But last night I noticed that when I feed him he swims up with difficulty, eats and...