Mine would eat lettuce, kens earthworm sticks, algae wafers, shrimp and tilapia with the occasional massivore pellet. They are garbage cans and will eat just about anything once settled in.
Great pickup! Down here those would be at least twice what you paid for them. I like the Pink Tailed Chalceus in that last tank shot as well....I have 2 with my school of RedHook SDs.
That is a really good price, I would have snapped them all up too. They look really good in there. I pretty much feed them the same thing as whatever else is in the tank (they eat everything and anything), and you can throw in some algae wafers in for good measure.