My nephew, 6yrs old, dangled his finger above my Oscars tank and took his eyes off him for two secs next thing you know my O had him to the knuckle and left a hefty diamond shaped bite mark on his finger. At dinner that night i noticed outta the corner of my eye my nephew checking his finger was still attached. I scared the crap out of him so bad he didn't cry he just stared at his finger...On another note i was at my LFS who have a large breeding pair of red devils, and out of the corner of my eye i caught the big male lifting a 10'' length of pvc pipe in his mouth and move it to the other end of his tank. so i couldnt imagine neing bitten by one of those lil MFKers