I tried feeding my fish bananas tonight, it was fun and the fish thought it was a blast. We got a new fish today (My wife actually asked for it for Valentine's Day) - it's a Niger Trigger and it loved the bananas. Here's a couple of short video clips.
http://www.youtube.com/user/FoosDez#p/a/u/1/yAnnh2TpWj4
Here's the Trigger
http://www.youtube.com/user/FoosDez#p/a/u/0/keeCA_nr4iU
Sorry for the crappy quality - it's just a cell phone video on the fly.