This might be old news, but it was new to me. In the Walmart fishing section they have a "Catch n' See Live Trap". It looks like a great fish trap for small fish. the opening to the trap is about one inch round, so it would only work with smaller guys like wrasses and smaller clowns. For $10 it is worth having around though. I could also see people covering the flow holes with fine mesh and having a nice diy fry trap.