Okay, maybe a stupid question, but has your fish ever tapped on the glass?
I was watching the fish with my cat and I heard three little taps on the glass: nothing was up there to tap on the glass, so I think it was fishie himself. It looked almost like he was trying to "bite" it, but I didn't get a great look. I thought it was adorable and quite surprising!
Has this ever happened to anyone else?
(Also, the poor little guy has a case of the ick! It's getting better now, but I guess it might have been darting against the glass or something like that.)