mine have lived until they were eaten , i usually try to get atleast 3-4 dozen.then i just dump them in .I have a mappa puffer,spanish hog,birf wrasse,lyretail hog,a lionfishand a harliquin tusk , and theyall go to town on them.Be sure to break off the larger males big clawso he wont injure your fish.I had one grab hold of my Lions eye once,since then i always remove the big claw.