These are found naturally in your aquarium which arrive on live rock, they are a similar size to brine shrimp and are a excellent food source for pipefish, seahorses, mandarin fish, dragonets etc, all of which eat these at a steady rate. If you replenish your system regularly you will give these a good chance of survival. They will feed on phytoplankton, detritus, and waste food so they are of great benefit to your reef system. These are found naturally in your aquarium which arrive on live rock, they are a similar size to brine shrimp and are a excellent food source for pipefish, seahorses, mandarin fish, dragonets etc, all of which eat these at a steady rate. If you replenish your system regularly you will give these a good chance of survival. They will feed on phytoplankton, detritus, and waste food so they are of great benefit to your reef system.