My Betta Larry is having some sort of problem. He acts weak and doesn't seem to have the energy to swim to the top of his aquarium. I have had him 2 1/2 years and am not feeding him or changing his water differently. He seems to tilt toward his tail when swimming and is VERY lethargic. He cannot swim on a normal plane. His color is good and he is still eating. I am sure he is dying. Any ideas?
Thank you,
Jeanne