Easy to use: 1. Just put in bait such as mysis, daphnia or blood worms, dead fish, shrimp, meat, etc. 2. Fill the glass planaria trap with water slowly, then push the trap into the substrate with the holes facing down. 3.The planaria are moving toward aquarium leech trap within minutes, rinse out next morning. Tip : 1.Simply bait the planaria trap catch trap and gently place it on top of the substrate, which would not allow any shrimp lets to be able to crawl in. 2. Recommend you to empty it every few hours if works well for catching planaria . Make sure to kill them before flushing, hot water will work. 3.Switch off lighting during planaria trapping.