What's wrong with my Betta fish?

Hes a super long finned betta I cant think of the name for him but he was 15 dollars hes always been less active then most Bettas but recently all he

He's a super long finned betta I can't think of the name for him but he was 15 dollars he's always been less active then most Bettas but recently all he does is lay down at the bottom of his tank his fins are frayed like fin rot. He's in a 10 gallon tank with 2 other Bettas which are all divided. The tank is heated and filtered and I do 25% water changes a week. Both of the other Bettas are acting normal. What could be wrong with my betta?

or:He's a super long finned betta I can't think of the name for him but he was 15 dollars he's always been less active then most Bettas but recently all he does is lay down at the bottom of his tank his fins are frayed like fin rot. He's in a 10 gallon tank with 2 other Bettas which are all divided. The tank is heated and filtered and I do 25% water changes a week. Both of the other Bettas are acting normal. What could be wrong with my betta?


or:well i heard that bacteria can grow on the walls of a tank i take it he has been in the tank for a while?Sometimes it happens that way no real reason for it they start looking dense then the others he might have got some of the bacteria on him. I would call the pet store you got him from and tell them whats going on also sometimes theres to much food in the water it will spoil.


or:Does he tail bite? My betta is a calm one but he tail bites :/

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