New Life Spectrum Invertebrate foods are fortified with calcium for healthy exoskeletons. These Spectrum formulas are designed for crustaceans and invertebrates like anemones. The high nutrient concentration found in New Life Spectrum is great for macro-feeding corals.

Reef Macro Feeder is a Medium pellet size at 2.0 - 2.5mm diameter while the Crustacean formula is a very small pellet size at 0.5 - 0.75mm diameter.