Size: Up to 13 inches Tank Size: 125 gallons per fish Lifespan: 10 years Water Type: Fresh Aggression Level: Low Care Level: Easy to intermediate The first entry on our list is the Bala Shark.

Bala, which was featured on "Shark Tank" earlier this year, was excited to join forces with Sharapova. She guest-starred on the show as an investor alongside Kevin O'Leary, Mark Cuban ...