Next year I'm ordering chicks but they only sell them in a minimum of 25. I'm planning on selling the extra pullets and eating the extra cockerels (only have room for 14 total). How do you keep them marked as they grow? Was thinking about those cheap colored rubber bands for little girls. Will those work or are they too dangerous? The hatchery I'm getting them from will mark the males with a magic marker but I want something that will last longer.