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I'm a bit confused by your post......
Do you have 2 females and 3 males together? That is way too many boys! One male can handle 10-15 hens (depending on breed and the source you get the information).
A breeding trio is usually 2 females to 1 male. If you are planning on breeding, I think you should probably separate the breeders.
You have 3 birds that are 6 months old and you introduced new chicks? Day-olds? Personally, I wouldn't combine two ages without a quarantine period and an introduction period, as it helps prevent lots of disease and problems. Day-olds should be in a brooder set up so that the temperature is constant. Also, the older birds may keep the younger birds away from food and water.
To lay eggs, the girls will need 14 hours of light per day. Most don't start to lay eggs until they are 4-5 months old. They need proper nutrition and good health. Once they start to lay, provide oyster shell separately from their feed. If they need it, they'll eat it.
We used chick start & grow and put the flock on layer feed when they were about 16-18 weeks old. Some people feed starter feed and change to grower feed at 8 weeks and then to layer or breeder feed at 18 weeks.
Scratch is like candy, meant to be a treat, no real nutritional value.
