My little neon goby had ended up in the overflow for days until I realized it and rescued him. Then one day he was in my fuge down in the sump. He would have to have traveled down the overflow, through the skimmer section, and through the bubble trap which has a carbon filter in it, and he stayed there for a few days. I thought he was dead till I saw him. Then I turned off the return pump to feed corals and turned it back on and forgot about him. Well he disappeared for a few more days and I started looking for him. Then I found him in the tank! The only way he would have got there is to go from the fuge section to the return section and get sucked up the Mag 12 and poured back into the tank. The real surprise is he's eating and fine, though a little more fearful and hiding. I hope he pulls through and learns to stay away from the overflow boxes. He is not going near them anymore. He's little, but the overflow teeth look too small for him. I feel lucky to still have him.
Kay
Kay