Vitamin wise, they need calcium. The calcium needs to be just that. No D3 added, etc. That needs to be the main vitamin that you dust your feeders with daily, since they are still juvies. You also need to keep a dish of the calcium in the tank with the leo 24.7. Weekly, you should dust with Calcium+D3. That should only be given around once a week. They can get too much of that, so make sure youre not overloading them.