My only pet peeve is when my betta just HAS to try and jump at my fingers when I'm sucking poop out.
The big pipette thing I have is just long enough to reach the gravel in Shane's 10gal. When I go to get poop out, he just kinda stalks around my hand, just waiting for me to get close enough to jump at. I'll look at him, and then at the poop, it's always so close, but if I go down any farther he'll be able to reach my fingers. xD
He's scared me many times this way, I'm really jumpy, so I'm always worried I'll jerk in the wrong way and hurt him when he does it! Silly Shane, leave my fingers alone. D:<