OMG the same thing happen to me but my algae blenny survived lol. I shut my mp40w as I was doing a water change and I didn't look at the wet side to see if it was clear, when i turned it back on I got an obstruction error. Looked in the propeller I see uncle benny lifeless, so I took him out and placed him on the frag rack he wasn't moving at all so I gave him 5 mins if he don't move he was going straight to the toilet turned next thing u know he just started swimming around like nothing happened lol Crazy fish