I was moving some plants around in my tank (some aponegetons) and it was pretty close to my male kenyis "cave" (a petsmart tree stump set into a hill of gravel to form a den) and he attacked my hand! As I was moving my hand arranging the gravel back, he bit at me. I thought it was cute at first, but then he thought he was winning, so I chased him off. His fins have been all flared up for a couple mintues, but he finally calmed down. Anyone else have that happen?