The crappie were anywhere from 5 to 7 inches. I had caught them when they were like 2 to 3. I had fed them guppies and small crickets at first. When they started getting bigger, I just fed them mollies and etc. For whatever reason they stopped eating the crickets when they got older. Also they would never eat nightcrawlers.
Like very small bluegill, crappie prefer small insects and crustaceans, daphnia and fairy shrimp as well as scuds are great food for them, also small crickets.
yes my bluegill were 1" when i brought them home and after a day they were eating flakes, and if you can't get them to eat at the top you can give them sinking pellets, shrimp would fill them faster because they eat a lot, i feed my fish twice a day as much as they can eat in a couple minutes but i don't feed them one day a week to help with digestion in the fish