"Pods" are various micro-fauna and other critters that will reproduce within macro-algae, sand and live rock & many eat detritus. These critters are good for a few reasons, but most importantly they are great scavengers. Copepods, mysis shrimp, mini-brittle stars, and bristle worms are very small and can fit into the small holes and areas where snails and hermit crabs can't. Also having a larger population of these organisms in your main tank adds additional live food for your livestock. Fish, shrimp, hermit crabs, snails and even corals will take advantage of this live food. Not only is live food more nutritional than processed food, it also gives a more natural environment to your livestock.
