hi im wondering if you can help me, i have a 12 month old qh black colt who is sun bleached and is starting to get a itchy tail, i am feeding him 1 scoop of wheat and charff and 1 scoop of grotouqe a day, there is good grass in paddock, im washig him with stop itch and his upto date with his worming, is he getting enouge minrals in his diet? should i be feeding hin twice a day? , im will to change feed if it helps, thanks bec