Dr.G's Rotifers are Feast for all Reef Inhabitants. Rotifers MAX are concentrated 100% Natural Brachionus Plicatilis - L type, and are the Perfect Nutrition for Reef Aquariums. Gut Loaded & Highly Concentrated, an essential food for hard corals & excellent for most reef inhabitants. Use when your Fish are Egg Laying & Live Bearing. Ideal for rearing fry.