Yep basically I feed them sugar-water as much as they'll take, and then feed them protein when they become especially interested in their outworld, foraging, etc. You can also tell that they really need protein when the brood's stomachs aren't dark. Then you really have to feed them. Sometimes to test it, I drop some fish flakes inside, and if they seem interested, I then dump in a mealworm, which they happily accept!
Manica invidia (1 queen, ~200 workers)
Manica invidia (1 colonies, 1 queens plus 3 workers)
Lasius niger (single queen, ~200 workers - naturalistic, predatory set-up)
Lasius americanus (1 colony, ~10 workers)
Tetramorium immigrans (3 colonies, 3 queens, ~ five workers each | 1 colony, 1 queen, ~1200 workers)
Formica aserva (aserva queen, ~15 Formica neorufibarbis workers)
"And God made...everything that creeps on the ground according to its kind.
And God saw that it was good." - Genesis 1:25