Opae Ula Shrimp are half inch shrimp that are found in Hawaii. They live in brackish water. They live off algae and like still water. No filters, pumps or water changes needed. They can live up to 15 years. I feed them a flake of fish food twice a month. There is 12 shrimp and 2 snails in this half gallon tank. The cam will be off at night.