Might be a bit annoying if they attack you when your hand is in there. Dont know if they would, but when we used to go diving, they used to attack you when you come around their territory.
LOL.. my yellow tails are only about 1-3/4" and when I get too close to their (used to get) area of the tank they nip at me. But, I haven't had my hands in the tank since I got clued in.