Tiny pods scurring about our tank are sometimes problematic, but not these guys. These are Mysid shrimp, which are very small and rather translucent. For a comparison, please note the size of the grains of sand in this image. Wrasses, mandarins and more would be happy to snack upon these little morsels of food. These appeared recently in my tank and may exist in my refugium, and this is the best picture I can get. Reef-safe.