1 of my chickens sometimes has a light brown poop and slightly runny, looking at other posts its not yellow. is this normal? they've recently been wormed and at the moment are having some apple cider vinegar in their water, all looking very healthy and eating and drinking well. i regulary check them over and all have clean vents am i worrying about nothing? also the other day we bought them a pecking block with corn and mealworms etc in, they went mad for it and i was wondering if they was a cheaper alternative or possibly make ur own?