Zoo Med Floating Betta Exercise Mirror. An exercise mirror that promotes natural territorial behaviors and provides enrichment for your Betta. Small mirror suspended with a floating ball When your Betta sees his reflection he will "exercise" his fins Reduces boredom from captivity Instructions: Carefully remove from package and rinse in warm water. Place the exercise mirror in with your Betta for maximum 5 minutes at a time, once or twice per day. Designed for minimum one gallon enclosures. It may take your Betta a few tries to get used to mirror.