good call, I will put a nylon over them, I do see him climbing a lot. He gets up to the top of the tank and then falls down. He always looks happy though, then again when I go to an all you can eat restaurant I probably have the same look. No worries Traveler, I know what you meant and I knew the score when I bought him. I will likely "rent" him and when my algae is gone trade him in at the lfs or message board. I can tell by his size and the irregularity of his availability that he has been traded before and this aint his first rodeo. Problem is my wife is becoming attached to the little guy and I am too kinda...he's pretty darn cute for a disgusting slug.