I've got about 20 slings separated into vials but the others are still in the tank that they were hatched in due to my fear of crushing them by transferring them. The ones in the vials have almost all eaten a f/fly but it doesn't seem that any in the tank are going after food. Should I keep tossing in a bunch of fruit flies or should I try a busted cricket or two. Any help would be appreciated. Thanks.