My cat has seen the fish, he just dosen't like watching them alot, actually one time I picked him up though to give him a better view of the fish and he was in a trance watching my gourami's slow movements about the tank for about 45 sec, then he quickly wanted to get out, and he gave me a bad scratch! You should see his face when he want to go out though, I can't refuse that face (It's like one of those pleading cute faces)
BTW- Thanks for the comment
Also another off-topic question to you: I have been trying to find out what type of cat he is (for some reason I don't know) and it seems he is a Norwegian Forest Cat, what do you think?