Think of the food bill is right! They always seem to be eating! We let our big ones only eat off the bottom of the tank. We call them the vacuum cleaners. They help me to keep the tank clean. Not sure I would want one at home though LOL. And most of the people I know who have been bit by a shark have been bit by a nurse shark.
nurse shark bites suck. my friend got bit by one. it sucked on to his arm and wouldnt let go. he had to kill it and go to the hospital so they could remove its mouth from his arm.