My fish has been on the verge of death for months now, always laying on his side at the bottom of his tank and not swimming. I wonder if he hasn’t been sick, but just depressed. When you are all alone in a tank by yourself and you see cats and dogs playing all around you, I imagine it can be sad as you have no way to advance your stature by networking with others as you are all alone in your sad little tank. I can’t get him a companion as he is a beta fish and he will kill his companion. My other animals frequently meet other pets and have a lot of fun with these interactions. Alas, even in the animal kingdom, social networks are unfair.
Poor Frank the Fish, hang in there little buddy.