My betta fish seems to be fighting to stay upright.

[wildeyed]

He has not been eating recently, either. This does not bode well.

I have him in a decent sized tank, with a bubbler. I change the water on a regular basis. I feed him a small pinch of dried mosquito larvae every day (occasionally I forget).

I just changed his water on the off chance that the kids had put something nasty in the bowl, although I did not see foreign objects.

Any suggestions?

on edit: We have only had the fish for six months. He was smaller when we got him, so I am assuming he was a baby. So I don't think he is suffering from old age.