I found my cory stuck against the intake part of my filter, tail in. It's an AquaClear 150. I knocked him out with the net, his tail was bent, and he floated around for a while looking almost dead. He finally came around and started moving around half normal, but seemed a little unstable. Things looked fine, he was looking ok, just hiding under a log. Next thing I know, he's back up, stuck at the intake valve again! I knocked him out again, and he came away from it after a bit of a struggle. He lay on his side (I thought he was dead), then "got up" and started wobbling around the tank. I turned down the intake flow, but it's always been fine in the past, and the intake suction is already quite gentle (this cory has been in my tank for a long time without any trouble). Any ideas and suggestions? He's looking not too bad right now, but this will eventually kill him, I'm sure, if it keeps up.