Nothing wrong with layer blend for hens this age. Many of us feed an all flock/flock raiser feed which is a little higher in protein, doesn't contain the calcium, and we provide the calcium separately as oyster shell or oyster shell mixed with crushed egg shells in a separate feeder. Layer feed is usually 16% protein, flock raisers and starter/growers are usually in the 18-20% protein range. When you have multiple ages, or have roosters in the flock, it tends to work better, they can take what they need and birds that don't need the extra calcium won't get it. The layer has calcium in it, but it's still a good idea to provide the oyster shell as needs can vary. Long term the extra calcium in the layer feed can sometimes cause problems. Birds out of lay (molting, winter break, or old enough to quit laying) don't need the calcium and it can contribute to gout, and kidney problems. It can also affect egg shells, too little can cause weak, thin, or non shelled eggs, too much can cause rough spots or lumps on eggs. Roosters don't need the extra calcium and it can cause problems for them. Baby chicks should not be given layer feed as the calcium can damage organs as they grow. So when chicks are in the mix the all flock is better, it doesn't contain the extra calcium (or feed the whole flock the starter/grower with oyster shell available in a separate feeder). I feed my brooder chicks a starter/grower while in the brooder and switch them to all flock when they go out with the flock, it's just easier. Broody hen raised chicks get the all flock from the beginning. Whether to use crumbles or pellets is just a choice, which ever form works for you and which ever your birds prefer. Be careful with the scratch. They love it, and it can make them fat and cause a lot of health problems. They will eat the scratch and leave the feed. It should be only occasionally, and all treats (everything other than the feed) should not be more than 10% of the total diet. It is VERY easy to over do the treats, we are all guilty of it sometimes.