So yesterday I decided to move my fire eel from 75g mixed tank where I was growing it out for the last 1-2 years to the 210 with bichirs. I decided it was big enough at 9” or so. This morning I woke up to find it’s tail sticking out of the FX6 outlet. I hoped he was still alive but even with pulling I couldn’t get him out. Had to dismantle the thing. oh well.