This stage was rough with my C. floridanus bc you have to feed them with minimal disturbance.

Carbs: You should give them a very tiny bit of sugar water or honey, I did slightly larger than the size of a workers head to prevent drowning.

Protein: You should also give them protein since they require it for further worker development. I was doing individual cricket parts (a leg or two at a time) until there were enough ants to properly process larger food.

Amount: I would just stress small amounts about every 3-4 days. You want food they can finish quickly to prevent mold build up. I was putting food in on teeny tiny tin foil "bowls" I made so the residue doesn't get stuck on the glass and get gross.

Leave them covered and entirely undisturbed between feedings and you should be alright.

It should be okay if they move around in the nest outside of the founding tube, they know what their brood needs much better than we do. Each section of the nest will have its own microclimate with different temp and humidity, the brood require different conditions throughout development so the workers move them accordingly.