My betta is 3.5/4.5 years old. We just moved him from his 10 gallon tank to a 3 gallon as he seems to be struggling. We know he's an old fish and he has very long and heavy fins. Someone in a group says he looks like he had fin rot, but I don't see it.
Can anyone confirm?
He has plenty of places to rest, but seems to be sleeping a lot and not eating as much.
Water parameters are all good.
Anything we can do to help our old man?
https://www.reddit.com/gallery/1fechgh
Posted by Perfect_Flatworm4981