Doggie - I don't have a fish trap, but I've always been able to get my fishes with a simple piece of plexi. I just use something that is long enough to make a triangular corner in the tank. I leave it there with for a couple days with one edge not touching the glass so that I feed from there and food flows out of it. After a couple days, fishes get used to it they'll go into the wedged section and at that time, I close it and net out the fish. I think it's easier because it's bigger and the fishes are more reluctant to swim into a large area as opposed to a smaller trap.