As Ridgerunner often states, these are individual animals and no one can predict with 100% what will happen or how they will act.
Generally speaking you have a couple of scenarios, and if you can prepare for them is best.
7 roosters + 30 hens and everyone gets along in one coop and free range. This would be sweet, but in my opinion highly unlikely. The ongoing problems would be a lot of over mating, and roosters fighting for breeding rights. If you have an extremely large set up, maybe. However, general ag practices, from horses, cattle, pigs, and chickens is to keep the minimum and a spare entact male animals for breeding. Otherwise there is a lot of strife.
A rooster/bachelor pen... these boys would need to be kept completely from the laying flock. You could free range them alternate days. However, rooster really only like hens, and want to be with hens, and if you free ranged them all together, they would have all of the problems if you kept them all together. If you only have two pens, one for layers and one for bachelors, not too big of problem. If you have multiple breeding pens and therefore multiple groups of chickens, the free ranging time gets to be much less.
I see you have a baby on your back, roosters can be dangerous around small children, especially with people who are just getting started with chickens and don't have a lot of experience with roosters.
And every time you hatch chickens, one can expect 50% roosters, so this problem will be ongoing.
You originally asked if keeping 6 roosters and 30 hens was a bad idea. IMO yes is the answer. If I had 30 hens, I would not want more than 3 roosters, and very likely would only have 2.
[Aarts advice to have different pens ASAP is very good advice, roosters don't slowly go bad, the signs are easy to miss, and you can be in a bloody wreck pretty darn quick, a pen to separate fighters needs to be available or something can wind up dead, and not a pretty death either[/B]
