just tried it on my flower. she spat the shrimp out the first time so i tied 3 knots instead of 1 and she swallowed it! HOWEVER... the next 3 worms were untied by her and she left the shrimp behind. just like a female to be difficult... lol ill keep trying for a few days. wish there was some "edible" string that i could use to stitch the worm up so that she couldnt untie them!!!