Here is my original trap, that has been used in a few tanks now
I snagged the baslett out of my tank (glad that bitch is gone!)
Stick the thing over the edge, prop the door open (angled to the opposite you see in the picture) drop some food in the tube, let it slowly settle into the trap. Sit back, watch every fish but the one you want go in... pull the string when it finally goes in!
I put this together quickly to catch the fish. My new one will have holes in the door to help it close faster. As well as some down the sides. It will help to keep the water moving a bit, and the food inside moving.
I just sketched a fast drawing (Its awesome, and I can make signed copies upon request! LOL) of the soon to be new trap. I think this would fit into a Canada post "box" If you do want one, drop me a PM/email, and we can work out the logistics of getting it to you.
[img=1400x787]http://jtcustomacrylics.com/wp-content/uploads/2013/03/WP_20130322_003.jpg[/img]
Jon