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!
Currently raising:
Manica invidia (1 queen + ~30 workers)
Manica invidia (3 colonies, 3 queens plus brood)
Lasius niger (single queen + ~200+ workers)
Lasius americanus (3 colonies, ~5 workers p/colony)
Tetramorium immigrans (1 queen + ~1200 workers)
Tetramorium immigrans (3 colonies, 3 queens)
"I discovered that if one looks a little closer at this beautiful world, there are always red ants underneath."
- David Lynch