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Actually, in a real tank thats not something that you are supposed to let happen alot. But, it generally does most of the time anyway. For some reason people seem to have some underlying need to do this. I have stood in an aquarium store on many occassions and watched it happen. It's like they expect the fish to swim up and wave when they tap on the glass. I think in this instance Jim is just looking for some slight "startled" effects to add some user interaction.
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