I would recommend keeping your baby in a 20g tank with low surface current. Feeding him freeze dried blood worms and a quality flake food. Maybe a baby cricket or two, once a week. I would avoid any tank mates except a couple of bottom dwellers to eat the food that sinks to the bottom. At about 6" start adding broken pellets into the flake food to help with the transition to pellets/food sticks. You could also add freeze dried krill, and cut up pieces of market shrimp at this time.