Currently, I have (2) 6 1/2 month old Seramas on eggs, because they both went super broody a few weeks ago. My own rule is to not allow them to brood any earlier, because I want them to mature more first. I collected eggs daily, blocked off the appealing nesting spots, and didn’t allow brooding until they were a bit older. I would also caution against housing a Serama with standard breeds. A rooster or angry hen can easily kill a teeny bird (accidentally or not). My Seramas are always housed separately, but with some of my other bantams only (Mille Fleur d’Uccle, Porcelain d’Anvers, and Silkie bantams).