Hello, I Have Ordered 15 Silkies From Cackle Hatchery And I'm Expecting To Get Them August 16th And I Still Don't Have Their Feed So I'm Going To "The Feed store" Tomorrow And It's 30 Minutes Away. I'd Like To Know(So I Don't Return) How Much Starter Feed Will I Need? 30lb? 50lb? For The Whole Time Until They Can Start Eating Different Feed(Treats).