Might be your problem. When I used a trap I left it in the tank for about 4 or 5 days until I caught the fish, I didn't remove the trap. I put the food in the trap at feeding time, and let it float out. The fish went closer and closer until they didn't fear it any longer and then went inside. When the fish I wanted went in I closed the trap and had him. For all I know they were swimming in and out of it when I wasn't home.