I have one tiger barb. The fish came with the tank and my dog was pretty hip on this new attraction. Bullet (my lab) would always stare at the fish and occasionaly hit the tank w/her nose til one day my tiger barb jumped out. Bullet had that fish in her mouth and the fish managed to squirm out and land on the floor. I picked him up and put him in the tank where he swam dazed and confused. That fish is the fattest and healthiest fish in there. I am amazed at the tiger barb's come back.