I have two Oscars about 6 inches long each and they love to try and bite
my
fingers when I feed them. I'm curious how hard they can bite once they
are
full grown. I have a two year old that likes to feed them. Should I be
worried that they could hurt his fingers or even mine eventually?

I once reached into my oscar tank to remove a thermometer he had broken and
he bit me hard enough to draw blood. Another time he went after the sparlkle
of my ring and bit down on my wedding ring. Reaching into the tank is
different than feeding though. maybe others have more experiences to share.
Jayne