I have some baby marbled crayfish that are almost ready to ship. They are maybe 3/4 of an inch right now. These will turn pretty blue if they are fed a diet high in spirulina and they are self cloning. Once they grow up you will likely have babies from them once every three months or so and the babies make good food for medium/large fish. I have some pictures in an album on my profile of the babies and the mother. If you're interested let me know. Also, they are fairly calm for crays and they don't fight much among theirselves. They will go after smaller fish if they have the chance, though. Mine had to go into my community tank for a week or so and ate a juvie bristlenose pleco. Larger fish should be safer.