I have a pleco that acts pretty strange occassionally. Sometimes he'll stay toward the top of the tanks suctioned to the wall. Normal, except he's upside down. He'll suck on the wall with his nose down and his tail out of the water. Other times I've caught him floating upside down (belly up) on the top of the water just swimming around and sucking on the surface of the water. I have two and the other one doesn't do either of these things. Has anyone out there ever seen anything like this?

Oh yeah, neither of them eat algea wafers. I guess they're living mainly off the food on the bottom of the tank. I have a very clean tank so I don't know where else they would be getting food.

Cheers,
Colby