I think that sometime while I was doing a waterchange, I must've hit and injured one of my Pygmy Cories... It's not quite dead yet, but it's about to die.
I saw it lying on its side while adding water back to the tank, and I figured, "GREAT! I killed one" And then I saw it struggling to swim on it's side. He kept doing the same thing... He'd lie around for about 5 minutes, then try to swim.... then just lie on his side, and try to swim again... He hasn't tried moving anymore, but he's still breathing.
I'm trying to figure out what I could've done during that water change to hurt him.
He's my first casualty in a loooooooong time (not including the new guppy fry that were born and eaten....)
Maybe he'll miraculously recover, but I don't see him lasting for more than a couple of hours...