1 Live Emerald Fire Crayfish/Freshwater Lobster (3-4 inch Young Adult) - Stunning Cherax Crayfish by Aquatic Arts This is a new variant from the Cherax classification that has never before been sold in the United States as of 3/26/14. It is a unique variety of crayfish that is a result of hybridizing two different species. Ships as 2 to 4 inch long young adults that are already of breeding age. Grows up to 6 to 8 inches long with colors greatly intensifying as the crayfish grows larger. This is one of the largest freshwater crayfish in the world at adult size, but it is less aggressive than P. Alleni (Electric Blue Crayfish). As many as 3 could be peacefully kept in a 55 gallon tank, but one is recommended if food is scarce. As with all of our crayfish, the coloration of the Supernova crayfish is extremely high quality. All Aquatic Arts (formerly InvertObsession) brand plants and animals come with a 100% live arrival guarantee, plus free email support directly from the owners!