Players that worry about sharks in poker games, have no business playing.
If you play in a game with a so called "Shark" and win, what does that make you?
After 40 years in the business, I say there are "NO" "Sharks" in 4 & 8 and under.
If you are going to be a winner at poker you must play 10 & 20 up, and yes there are better players up there.