Glass Fish BowlMinimal glass fish bowl aquarium suitable for easy aquatic and terrarium set ups and an ideal choice as a focal point to any space, making a great choice for planting and keeping smaller fish species. For Betta: Please add a mini heater which is sold separately in our store or place the bowl in a warm area with regular water changes to keep the fish more comfortable. Betta fish prefer warmer water temperatures and may become ill under cold air