Hi, I have 1 BO and 1 EE that I've had since Tues. Both are doing great. I've been feeding them the medicated starter bc I got them from the feed store and dont know where they order from.... My question is I'll be getting 2 more tomorrow from a different feed store. 1 welsummer and 1 BR...Can I stick them all together or do I need to separate? Oh if so, for how long?