Hi there,
I don’t have any experience with trios personally, but I do know that bringing in a new bun can disrupt a current bond (especially a new one). That said, it usually just means you will need to keep a close eye on the pair when you bring the new bun in, and be prepared to do some bonding sessions with them if they get testy with each other.
My observation on bonds being upset is usually due unneutered/unspayed buns around. They smell SO CRAZY to the other buns that it can really upset them. Our rescue has tons of bonded pairs and they usually do fine with other rabbits around. The odd pair will start chasing (esp new pairs that come in), so the volunteers keep an eye out for it.
I think if you would like to try for a trio, I would first find out what is going on with Lucius. If he hates other bunnies, then you’ll know the trio isn’t an option. Similarly, some bunnies have medical problems that make it impossible to bond them with other buns (they just need too much monitoring).
Since they aren’t fully bonded yet, it might be fine to home Lucius sooner than later (if you really want him… I can kinda tell you do, I know that feeling
). That way they will bond with Lucius already around, and you won’t have to worry about a new bun disrupting a new relationship.
If you do want to try for a trio (sorry there are so many “If’s” in this response), it would be good to take your current buns on a speed date with Lucius to see how they get along. Many people bond trios as a group vs. working with groups of two, since group dynamics are different than individuals, but there are lots of dif strategies out there. It all depends on the buns. Some just go together easily, others need more work.
Sirius&Luna has a thread on bonding her recent trio, she started off with a pair: https://binkybunny.com/FORUM/tabid/54/aft/165467/Default.aspx
Bringing home the third did disrupt their bond, but the new bun was a hormonal baby who wasn’t neutered. Once he was neutered she had a relatively easy time bonding all three.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.