How do you tell an adult betta fish from a baby fish?

* Size: Adult betta fish are typically between 2 and 3 inches long, while baby betta fish are usually less than 1 inch long.

* Color: Adult betta fish typically have more vibrant and elaborate colors than baby betta fish. Baby betta fish may also have a greenish or brownish tint to their bodies.

* Fins: Adult betta fish have long, flowing fins, while baby betta fish have shorter and more rounded fins.

* Behavior: Adult betta fish are typically more aggressive and territorial than baby betta fish. Baby betta fish may also be more shy and timid.

It is important to note that these are just general guidelines and there can be some variation between individual betta fish. If you are unsure whether a betta fish is an adult or a baby, you can ask the pet store employee for help.