A rubber boot mat turned upside down, lol. Easy to clean, good traction and high contrast for finding feed. Seems to be working well,
A note for those interested in Fermented Feed for chicks. I gave them both FF and reg. starter the first day, they definitely preferred the reg. starter. I almost caved in but only offered the the FF the second day and they eventually got into it. Now they run when I refill the dish.