Time release food blocks made especially for feeding nano aquarium species of shrimp, crabs, crayfish and fish. Contains Plankton & Spirulina for the long-term health of your nano aquarium animals. Great supplemental food source for difficult feeders. Can be used for routine feeding to provide enrichment and variety, or for weekend and vacation feeding. Will not cloud the water and is formulated for fresh and saltwater species. Royal Item Number: AZMBB9