Are my betta's fins okay?

[Cool fishes]

Hi, I've had my betta since 3 years ago when I rescued him from poor living conditions in a neighbor's house. His fins have always been droopy, but I've recently noticed they're a little stringy/ torn looking. I don't know much about fish keeping but I try to make sure I get the basic stuff for him. He's in a 5.5 gal tank, has a sponge filter with no strong current, no plastic plants just one big live plant, a smooth cave for hiding, and smooth pebbles on the tank floor. I do 30 % water changes every other week and he eats very well. Am I overlooking something? Is he just old? Any suggestions or answers are greatly appreciated.

 

[nik_n]

My guess is that he is just old. What are your water perimeters?

 

[hansgruber7]

You should test your water, especially for ammonia. I would up your water changes to every week. Every other week is not enough in my opinion.