larrynews, i have found that you have to be there when the fish go in, it is hard for them to find there way out, but they can excape if your not there when they go in, i have caught every thing in my tank within 20-30 miniutes after i put it in, my biggest tang which is about 6 inch is addicted to it, but i did forget to tell you to bait it, i usually put a piece of frozen brine shrimp in the trap and it will float around inside and the fish see it and go crazy have to have it, and they go in, i have used my bottle trap several time 100% satisfaction,