Cornish/guinea/australorp integration help p,ease

[kjxoxo1]

I have 50 Cornish x ( supposedly mixed but looks like majority roosters) which are 8 weeks old and 3 black australorp roosters who are 7 weeks old. Right now they are inside the chicken coop. The older flock consist of 3 Cornish rocks ( 1 rooster 2 hens), 20 mixed guineas, 11black australorp hens who are all 18 weeks old. My guineas are extremely active! I'm not sure if they are playi g with each other or fighting..... I need to integrate my flock. How safe is it to integrate right now. It is becoming harder to feed the Cornish in the coop as they tend to want to run out and it's not safe for them ( I have dogs that are not chicken friendly...first time they have ever seen chickens was 18 weeks ago. I'm a newbie). I need to clean their coop, etc. Just need to know if you guys think the 18 weeks old will immediately start fighting my younger ones .... Thanks