This is more of just a curious question. I have never stuck my hand into my bettas tank before while he was in there until today. The tongs I used to move stuff around in his old tank were long enough to reach the bottom, but in his larger tank it is a bit too deep to reach the bottom without my hand being sort of in the water.
I was putting a new ornament in there a few minutes ago and he kept swimming up to my hand and around the handle of the tongs. My hand was clean, I just didn't want to stick my whole arm in there :p He seems to love following my hand around, especially when it is IN the water.
I also saw a video yesterday on youtube of someone holding out their hand at the surface of the water and their betta swam into their hand and used it like a hammock. So, I was just wondering, do you guys ever do that?
Also, I'm a bit scared of him biting me :p even though I've been told that it doesn't hurt. This is just a curiosity more than actually wanting to hold my fish, by the way, but he really did seem to love my hand!