I like the make-shift trap from the coke bottle; haven't heard of that. If that doesn't work I have used a fish trap called "The Trap" which has a door that you hole open with fishing line. You put food inside and after the fish swims in you let the fishing line go so the door slides shut. Two problems 1) you have to sit and wait for the fish to swim in which can take awhile 2) the trap cost $60, but is probably worth it.
Good luck
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