Hello and welcome to BYC! Glad you joined.I bought him at 2 weeks old in February 2022. Not sure if hes a bantum or a silkie.... i feed plenty of scratch but i also feed black sunflower seeds, oats, 10 grain, cracked corn and i throw crumbled oyster shells in their cage about every 2 weeks ....they have plenty of cover from the sun and water and wind, plenty of sun if they want it.
Unfortunately, what you are feeding them is not a balanced, complete diet. They should be on Flock Raiser or chick starter with oyster shell offered in a separate container for free choice feeding. Everything you listed should only be feed in tiny amounts. No more than 5% of the total diet.