Know that the two I got shipped to me about two weeks ago were on the tiny-side of TINY! I’m trying to keep them alive in my DT (substrate bottom), and they are slowly starting to pick at it— but honestly their mouths are so small for the size of the aragonite. Like you I assumed that by being ‘tank raised’ they would immediately know to go after prepared foods, but I am having a tough time with even brine (not Mysis) shrimp, and the smallest flecks of flake food from the bottom of the barrel. I suppose this is a long-winded way of saying don’t assume they will arrive ready to devour food, if they are tiny fish upon arrival. The good news, however, is that each day they are exploring more of the 20-gallon tank, swimming together a lot, and not feeling picked on by other fish. I think they will make it. Best wishes!