I would brood them separately, or at least divide the brooder because I have heard of conflicts due to water issues and size.
For a cleaner brooder . . . . manage the water!!!! So, how are you going to reduce splash and wet bedding? I found that wet bedding dropped the temperature 10 degrees!!!!!
Hay works really well on keeping them dry and trapping some heat! Also, it cuts down on the odor!
I put wee-wee pads under the hay to absorb some spillage...but if you feel that step is unnecessary skip it, I however found it to be a life saver
