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What is the age of the chicks you are getting? I am going to assume day olds. Whether you feed medicated or not has alot to do with where you are located and how prevalent coccidia is in the soil where you live. Coccidia (the parasite is coccidia, the disease coccidiosis) is a parasite that causes an infestation in animals called coccidiosis. Left unchecked it can overwhelm a young chicks body and kill quickly via the diarrhea it causes. The parasite tends to thrive in warm, moist soil conditions. Here in SW Arkansas that's exactly the type of climate we have and
unmedicated chick starter is next to impossible to find. In dry, cooler climates you might be hard pressed to find medicated starter.
The typical medication in chick starter (amprolium) is NOT an antibiotic as is commonly believed, but rather a coccidistat. It aids in the prevention of an overwhelming infestation of coccidia while giving the chicks own immune system time to build an immunity to it.
If I am brooding chicks artificially (in a brooder) I most definitely use medicated starter, because the chicks only exposure to coccidia is in our soil when they go outside, which is of course loaded with it.
If I am letting mama brood them in the coop, I don't feed medicated starter. The chicks will be slowly exposed to coccidia through the droppings of the mama hen and the other chickens; in effect doing basically the same thing as a medicated chick starter. Mom and the other chickens having already gained an immunity to it.
I hope the above is clearer than mud.
As for protein % of chick starter, I *think* 18% is typical for starter, but I don't think 20% is out of line.
Grit? It's not necessary for chicks, IF the only thing you are giving them is their chick starter. Grit, in chick size, becomes necessary once you start offering foods that require "grinding" in order for the chick to digest them. Think of grit as the chick's teeth. I don't even use it because all of my chickens, from the week olds on up are outside free ranging all day and find their own little pebbles to ingest as grit. It's stored in their gizzard and the strong muscular action of the gizzard uses the grit to grind up the food.
Scratch? Scratch is the chickens form of candy. They love it, but it's totally unnecessary and (in the case of corn) not all that healthy for them. Around here we have several forms of scratch available - Scratch: If I ask for that at the feed store what they will give me looks like corn meal. Basically it is. It's ground corn. The only thing I've found it to be good for is to mix with warm water or yogurt on a cold winters evening to offer the chickens before they go to bed. Helps warm them from the inside out. Chops: This is chopped up dried corn. My chickens will hurt you for some chops. Low protein, high fat. And lastly, Scratch grains: This is a combination of chopped corn and some other grains like oats and some seeds. Chickens like that too. For the last year or so I have chosen to feed something called Black Rooster instead. While similiar to gamebird feed, BR is a unique form of gamebird feed that combines feed pellets with grains, some corn and black oil sunflower seeds (BOSS, which incidently chickens also adore). It's high protein, great for condition of feathers and weight of adult birds and low fat. Still, if your chickens never saw a bit of scratch in their lives, they could live long happy lives and never know what they were missing.
Hope this helps.
ETA: Your chicks WILL NOT NEED calcium, until they are of laying age. There is just enough calcium in chick starter/grower for growing bones; not enough to hurt their kidneys.
