I found a couple of combinations tonight that my crabs are loving...haven't left the food dishes yet tonight!! I always provide them with two food dishes (one "meal" and one "treat") that I change every day or two. Tonight for their "meal" I mixed Hikari Bio-Pure Freeze Dried Krill (that I crumbled with my fingers) with calcium powder, spirulina powder, and cod-liver oil. For their "treat" I mixed Gerber sweet potatoes with calcium powder and organic corn meal. They've been climbing over each other and alternately "guarding" the food dishes all night now!!! They especially seem to live the sweet potatoe mixture! Yeahhh!!! I'm such a dork, but I love it when I find a new combination they love!!!