OK..I feed my 8 month old chickens egg pellets, corn scratch, table scraps, veggies, etc...... I supplement with oyster shell. The egg pellets are supposed to have all the calcium they need , according to the guy at the feed store. Is the oyster shell all the grit they need?? Is oyster shell considered grit? Seems to me it would be too water soluble to serve as grit. My girls have been laying great ....I am so proud of them...their egg shells are so strong you have to beat the eggs to break them! I just wanna be sure they are able to digest their food ok..... Any advice is very much welcome! Thanks in advance !!!