Shining the light was suggested, but my Tang took off like a rocket when I did it to him twice. Plus I have a lot of cave areas and the tang slept in those. Ultimately, I left the trap in there for a couple days with some food in the very back. All the fish got used to swimming in and out like it was rock work. First time, I let the cord go to shut the door the tang beat the door shut (and that door shuts fast). He moved faster than I blinked. Second time, the flame angel blocked the escape. Happily living in Sals tank now so i am a big fan of the traps, but they did scuff some coral as my tank is pretty packed.