i have a fish trap, not sure what kind. but they all work the same. i got it for ich. i had a small tank at the time, 29gal. so i ended up ripping the tank apart. my friend did use it. he started by feeding the fish in the trap. and if the fish wanted to eat they had to go into the trap. the clowns were first, then all the other fish followed. took about 3days of feeding in the trap. but it finally work. damn damsel!!!!