HI! My three chicks are five weeks old and have not eaten any fresh food. I went to a feed store when they were about three weeks old looking for chick grit and they only had adult grit. I know you only feed chick grit until like 8 weeks old. Do you think Ishould go to a different feed store so they can get some fruit now or wait three weeks to get the adult one? Can they still eat chick grit if they are older then 8 weeks if I get it now? They have gone outside and eaten some stuff out there. Thanks so much!