I have the same trap and have been successful twice. I caught a coral beauty within minutes but with a 6 line I had to get creative. I would put food in the trap and be standing 5 feet away and the 6 line would literally look at the food, then the trap door, follow the string all the way to me, and then he would take off. What I did was- took the door off and used a baster and feed my tank for a few days through the feeding hole. Then I put the door back on and kept feeding the same way. But this time i used 4lb test fishing line and i wrapped around something and ran it back to the other side the room. But I would feed and leave the room. Wouldn't even sweat it. Then I skipped a day of feeding and the next day....BAM! GOT HIS butt. I feel like the more I tried and was constantly in the glass sweating it the more he was like "NO WAY, BRO". Just drop it in and let them get use to it.