I have a male crowntail betta. He is laying at the bottom of the tank, partially on his side, doing nothing more than breathing. I can't get him to swim at all, or eat.
He lives in a 5 gallon heated and filtered tank. It is at 78 degrees at all times. Zero nitrites, under 40 ppm nitrates, what my kit claims is the safe zone.
I left for the long weekend and so he was on a 3 day betta feeder. When I came back, he seemed fine. But it has been about 2 days since he last ate, which is not normal for him at all.
I have had him for about 3 years. He was full sized when I got him at the pet store, which I know means he could be at least 4 or 5 years old, is this just senescence? I can't see any visual cues for sickness on his body, other than holding his fins clamped. No velvet, no rust, no ick, no fin rot.
This is exactly how my female betta acted before she died, so I am really nervous. Any advice would be much appreciated.