Hi all. Last night I went and looked at my tank. I saw one of my cory's floating on his back going straight to the bottom. He layed there not moving. I took the end of the fish net to see if he was dead. He didn't move. So I went to get something to put him in,came back he was gone. I did a head check with all the cory's couldn't find him. A few minutes went by then I saw him swim straight up to the top. As he was doing this he was spinning. Then he layed back down again on his back. So I took him out and put him in the QT. He look a little red by his top fins and wasn't moving much. So I kept him in there over night. Today he is swimming normal and not red any more. Not sure what happened yesterday. Maybe he bumped his head or something. Thank goodness I didn't throw him out. And thank goodness for my QT. This cory is the smallest of my 6 cory's. I make sure I feed them well and my water all checks out and other fish are fine. The strangest thing. Just wanted to share. Thank you . Tina