Crave™ - Crave is a balanced blend of spirulina, krill and/or shrimp in ­flake form, developed for community aquariums, both fresh and salt. Floats on the surface then slowly sinks. Fish have time to eat before the ­flakes reach the bottom. A complete diet for all community and marine fish. Our probiotics promote healthy fish growth and digestion with less waste to foul the tank. No hormones. No artificial color enhancers.