Food question - how to????

Hello everyone,

Thank you so much for your help with Goose and Duck.  I've now got a request for advice or suggestions.  I've been thinking about this for weeks but haven't yet come up with a solution so I'd like to see what you ladies and gents think.

I've got the three rescued chicks who are 10 weeks old-ish, one is definately a cockerel the other two appear to be hens so far, one definately, one i'm only pretty sure.  They need to be eating the growers pellets and they're NOT to be eating the layers mash.

I've got the three layers about 9 months old-ish who are all eating the layers mash as they should be and they're NOT to be eating the growers pellets.

All six birds free-range all day, unless we're not home then they're left in their runs with a bucket of freshly picked weeds and their respective feeds.

What i've been doing is locking up their runs while their free ranging and every couple hours putting them back in to have a feed of their mash or pellets.  this is fine for now but soon i'll have a newborn and this won't be a possibility.
 
My first question: How detrimental is it for them to eat the wrong food? i.e. chicks eating layers mash and layers eating growers pellets.

My second question: How do I allow them all day access to their feeds while free ranging if i can't allow them to eat the wrong feed?  If I leave it out for them Greedy Guts Duck will eat all of it and just get fat. (i've even had to seperate her for the day as she's become very agro this week)

Thanks heaps!
Vi

i was to a bit worried about my babes eating layers mash at 10 -12 weeks old so i just mixed both growers with the mash , seing that the babes decided they were no longer going to stay within thier seprate bit of the run  and they are all fine now and hopfully ready to lay by the end of september .

I was hoping you'd all say that!!! GREAT! I'll not worry about it anymore   All the warnings on the packets etc had me believing there would be huge problems if we let them eat the wrong food.  But then again, i do have an over developed sense of safety (that's P.C. for paranoid i think)

I'm not too worried about the amount of eggs.  They give us more than we really need anyway

Thanks heaps
Vi