My chicks are almost 7 weeks old. I have been letting them out in their yard for 20 minute supervised sessions because we have hawks that are just waiting for a chicken dinner. I ordered netting to cover the yard that we will install next week. This is their yard. I read a comment by another member that you shouldnt let them eat tall grasses ,it will impact their crop and cause illness. My question is, do i need to run out and mow and weed wack all the talll grass in their yard before letting them out full time? They have access to grit.