Like the use of the big white washer spill trays under the roosts--we use one on the floor under a hanging feeder to catch spilled feed and contain it so it doesn't get lost in the shavings.
Should probably remove the corn from the layer feed--their protein levels may be too low. Layer is at least 16% protein but corn is only about 8%. You could feed them some corn at the end of the day in a small amount, but heck, my girls would eat out all the corn and leave the pellets if I did that.