As I was doing my 25% water change tonight in my sick tank. One of my plecos came an started sucking on my hand as I was draining the water out. He wouldn't leave me alone after that. He would swim to a near by plant and if I stuck out a finger he would quickly swim back to me and sit on my hand for a while. I figured it was probably a one time thing. I just went downstairs to check on the tank and I decided to see if he would do it again. I put my hand in and he came right over. Do I have a new best friend or is there some kind of scientic explanation. No, I am not coated in algae.