Today I went to my friends 17th bday and gave her the fish that I was holding for her mom. About 15 minutes ago my cousin came over with 2 Rosy Barbs. I have been doing research and every where I go says 5g minimum tank size. Now is my tank suitable, its a 10g? Do they get to 2.5"? Can I probally add 2 more if the tank is big enough?