We just brought home two 3 day old Marens. I am feeding them the same organic grow mash I feed my 16 week old chickens. They just seem to be pecking at it with not much interest. There are some poops, and they seem energetic, but cheeping loud! I ground it up finer in a cuisan art blender and they still don't seem that keen on it. Should I just be using plain starter? I have about 40 minutes left to go out and get new food, or will they be ok overnight?