Right now they are in separate brooders in my basement.
Thanks for your help!!!!!!
I brood bantams and LF together from day 1 and have never had an issue. Getting small shipments of both (6 LF, 7 Bantam) this eek actually and will brood them together again. Most of my LF are smaller breeds (barnyard mix of cream legbar, olive eggers, hamburgh) but I do have an orpington thrown in the mix with my leghorn & sumatra bantams. I check them when I feed and water and might take a look every now and then but don't go out of my way to hover over the brooder.
Ok, I really appreciate the advice. I anxiously awaiting to finish up my coop and get these birds outside. It's going to have to get a bit warmer though before that happens. It's still in the upper 30's to upper 40's at night here still. I'll be running at least 2 heat lamps whenever I do move them outside into the coop.