@Mixed flock enthusiast, yes, they have chick grit.
@R2elk phew! And thanks for sharing your opinion. It was the lower one closer to the bottom of the "1" that looked odd. I can tell you it was super duper fresh -I saw it land- and was right after a period of mild stress. They had just returned from their transport carrier back to their freshly cleaned pen.
Since they are big kids now at 3 weeks, they have decided they will roost like adults when the heat lamp is off during the day. Apparently, they are also too grown up for the heat plate. They totally eschew it this week. But turn on the heat lamp at night and they are like moths to a flame.

They return to being babies who like to pass out nestled together under a warm glow.
At what age do you think they can rely on the chicken nipples for water? They've had two types of waters for two weeks. This weekend, I watched when one was pecking: the inside of the plunger was wiggling around but I could not see on the keet's side if he was getting water. They certainly prefer the traditional waterer. But having two waterers in the outdoor brooder will be too crowded. I'd like to transition them to the chicken nipple before the move.