I've got a golden head sleeper goby I have been trying to get out for a month or so now. Tried fish traps both bottle and one from LFS with no luck. I am seriously about ready to rig up either a harpoon or a small fishing pole. I don't care whether he lives or dies at this point. I'm gonna chop him up into little pieces and feed him to my anemone just for some payback little bastard!
I use a big clear plastic bag taped to metal hanger to make a giant net looking thing...... I place that in the tank. I then stick my arm or something in another part of my tank to scare the fish they usually will swim right into the bag and just pull them out.
its ghetto but works for me.
Have you had any luck? I need a trap to get my emperor angel out. The coke bottle has not worked yet. He will enter the bottle, but will not swim through the hole (inverted part).
If I had a trap with a door it should work great.
Good luck. I am still trying to catch my Ocean Tang. (for you). I have tried everything short of the above bag approach. I wonder how much beer it took him to decide to that... Seen your tank video- 375g, not sure thats a great idea.