That's very interesting. I've never heard that either! I'm kind of scared to try it with a $50 shrimp though. What if the colander blows over?!I’ve heard that you can use a colander, or similar, to put the Harlequin in to keep predatory fish away because the starfish will be drawn to the shrimp through a chemical/hormone type reaction. I’ve never used that method myself but I’ve had many tell me it works.