Lavender Dumbo Premium Halfmoon Betta Fish is from 3 to 6 months old. Lavender Dumbo Halfmoon Betta Fish have stable genes and have been bred for more than 10 years. Therefore, their body, shape, color, and size are the same. In addition to our hand-selected and strictly graded requirements, we ensure that these betta fish are 90% matched with pictures. Please ensure to check out our betta species guide to make sure that you have picked out your favorite betta type/species. The lighting we use might be different from your aquarium. So colors might be lighter or darker depending on the light you have. Fish might likely arrive lacking color due to stress from shipping. The fish's colors will be back to their original color when the fish is settled down and adapted to the new tanks. We highly recommend feeding Bettas with New Life Spectrum Betta Pellet. As it will help to enhance the health and color of your Betta. All our fish are fed with this pellet from fry to adult. Visit here for more information on How to Care for Betta Fish. When you buy multiple Female bettas and put them in the same tank. It will become a sorority betta tank. The betta sorority should be a minimum of 6 females, and there is no maximum, with a minimum 20-gallon aquarium. However, please ensure that to follow the rule of 1 gallon per fish. The required equipment in the tank is a heater at 82F+ and a filter. Please visit our Care Guide for Sorority Betta. Please select the desired quantity that you would like to purchase.Quantity = 1 means we will ship only ONE fish. Due to the natural nature of this product, we cannot guarantee it will look exactly as the picture* Size Large = the back fin will be really big and long, the total size of the fish is 2.5 inches or more. The fish is 5 to 6 months old. Size Medium = the fish is younger, 3 to 4 months old, with fish size 1.75 to 2 inches, smaller fins but they will grow big.