2 large cuttlebones
1 cup dried rice (any non-instant type)
1 cup unflavored oatmeal
1 tsp. sea salt. NO table salt!
1/4 cup dried plankton, krill or any other very stinky dried sealife
2 tablespoons spirulina powder (you can buy this at almost any health food store)
Break up the cuttlebones with your hands into nickel-or-dime-size chunks. Using an electric coffee grinder, powder them. Sometimes they get stuck in the blades -- if so, stop grinding and poke them out of the blades and continue grinding. Take all remaining ingredients except the salt and grind them into a sort of lumpy powder fine powder. The krill won't completely grind so just get it to where you can stand it.
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Since this is VERY high in calcium (two whole large cuttlebones are a double-whammy), it is an excellent food for your crabs who are exhibiting molting signs or those who have recently molted. It does not have much carotene though so please add in a source of it, like carrot flakes or some raw carrot.