I keep 2 colonies of 5.25 per colony in a rat rack, this isn't counting the offspring they produce just the breeding colonies. I eliminate my rodent costs and even make a few bucks (not much trust me) selling to local reptile owners in the area. If you only spend 5 minutes in a reptile room per week with this many animals your doing something wrong. I've had picky eaters in the past as well but I've yet to meet a snake that didn't transition over to rats if your persistant (no, not starving an animal). I've just started to transition over to ASFs, currently have 3.9 hoping to fully transition once we get the ball rolling with that. I've tried 1.2 - 1.3 - 1.4 and 1.5 sure it works but takes way too long. Most of my rodents are very docile and I even let my kids play with them. The only fighting I get is over a custom wheel I just put in last week in every rack enclosure, but nothing major.