My fave would have to be my 2 year-old clown loach. He's about 4" long and just has a blast being the BFOC (Big Fish on Campus). LOL He has a little buddy who is about one year old, and half his size. They swim in circles and just have a good ol' time doing their loach things.

Recently we moved them from one room to another we use more often. My wife looked under the stump and saw that "Senior", the older clown loach, was lying on his side. She said, "I think Senior might be dead." I asked her why, and she told me about him lying on his side. I told her, "Nah, he's just hanging out. That's what he does." She didn't believe me until she got closer to the tank. He rolled over, shot out of the stump, and started swimming as he always does. Now my wife is used to his "clownish" behavior. :D