Got mine this morning. Overnight express order. After being in my tank about 3 min. It went to work. I got home after being away for about 12 hr. and it was still eating. My Flatworm problem is being taken care of naturally. No chemicals or time consuming vacuuming. I don't even need a major water change because of the toxins released by massive FW die off. And I have a cool looking critter to boot.