I caught 2 a while back with a plastic bottle method which I read about here it worked .Basically your tank is going to look like a mess because you leave the bottle in there.for a while to desensitize them to it and you put food in there everytime you feed .One end of the bottle is cut out so they could move in and out then one day one you least expect it there in there.It took me a couple of tries because when you move to get them they move out but eventually you will.