I think we've settled on ordering Mazurri waterfowl feed for our coming ducklings but i have a couple questions on using their feeds. -Do i still need to supplement niacin if using the Mazuri feed? -How long do i use their Starter feed? Their website just says it's for all newly hatched or adolescent birds. But the protein level is 18% and i thought that was too high during the "grower" stage of older than 3 weeks of age? -When do i start their Maintenance feed? Their website says it's for all non-breeding mature, fully feathered birds. Do i wait till they're of age to be laying or switch to this at the "grower" stage? Thanks for the help. Their website is a bit vague.