I was just wondering...how exactly can you tell if he's happy?
I was wondering the same thing.
Membri123 - would you like to live in your toilet, with it only being flushed every few days? Probably not, right? Well, that is what you are doing to that poor fish. He needs a tank with at least a filter. 10 gallon tanks are not expensive and like Luvnature said you could probably find one at a yardsale. Goodwill, Salvation Army or other thrift stores are a good place to look too.
I wish you would take people's advice, we only want whats best for your fish.