won't that be stressful on the 3 that are already together to pull one out?
It's mostly stressful for you. Believe me, I know. I'm still stressing out.
Your situation is a little different from mine & you have a good jump start on yours where you could possibly
do the 2/2 split & they be very happy that way. You have 2) 5 mo old boys, you just put in a 1-2yr old, & now you have
a 7mo old. you need to know there personalities, which one is the most dominate. The oldest one should/may already be settled
in his maturity. It's the two 5mo old that will start going into puberty soon. How long have you had the two 5mo olds together?
1) you can put Older one with a younger one or
2) most dominate with least
There can only be one alpha
3) Neuter him & let him have a wife
(of course they would have to be in a separate room away from your other 2 boys though)
and also...what is the history with the 7mo old recue that you just got? Has he had a roomie before or has he been a loner
in the past?
This is really your decision. I tried putting one of my least dominate boars with Gus & he was younger but Gus is to dominate
I was afraid they were going to fight & after watching them together, my 3mo old wined a little so i put him back with the other 2
and now they are all happy as ever. Gus is just alone but his cage is so close that he can hear & still communicate with them. Sometimes they even snip at each other through the cubes. You will figure it out. You can always try to put 4 in. It might work for you but I'll never do it again. Let me know how it turns out or what you decide.