Posted: Sat Nov 27, 2010 2:03 pm Re: pileing up!
Welcome. If they're doing it in the water, as long as there's no aggression (nipping at the neck, etc.) then there shouldn't be a problem. If it's while they're basking, the one on top is trying to get closer to the heat.
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-