I currently have five budgies, a tamed pair in a smaller cage (Loxis and Tsuli), an untamed pair in a very large cage (Iso and Mai) and one on its own (Sol) in another small cage. Sol, Mai and Iso (Iso is a female) were bought together and in the same cage. However Mai and Iso starting behaving aggressively towards their sibling, not letting him on the perches and pulling out his feathers. After sustaining a minor injury I took Sol who was being picked on to the vet and have now separated him into a separate cage.
My problem is that he doesn't seem to get along with either of the two pairs of budgies, but seems very depressed on his own.
What would be the best thing to do in this situation? Do I keep him on his own?

When I had 4 budgies and bought a fifth, I was advised that getting a 6th budgie would be a good idea. Although Skye didn't get picked on, as has happened with yours, he did become the odd budgie out and I ended up getting another budgie as a companion to him.

So I would think that getting another budgie for him would be a good idea. Ideally, is little Sol is male, a little male friend for him would likely make him a very happy budgie.

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When you mean he doesn't get along with your budgies, does he also show signs of aggression? Or is he the one who always gets picked on and attacked by the other budgies?

It's important to know who the instigator is and whether your lone budgie is actually in the right frame of mind to fully accept and benefit from the company of a new same species friend or not.
If Sol's temperament isn't overall calm and docile, then you can still continue to have problems even after getting a him a friend. And if that turns out by being the case, then you can refrain from getting another budgie and spend some extra time in trying to build a stronger bond with him in hopes of getting him out of the depressive mood.

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RIP sweet Tito (Summer 2008 - January 17th 2013).
You are missed and never will be forgotten.

Since Sol was being picked on by his siblings he may need a little time before being introduced to a new friend. How old is little Sol?

Do your budgies get supervised out-of-cage time together?

I believe I would try giving the current budgies supervised out of cage time to see if Sol seems to be interested in interacting with other budgies or he seems to be more of a loner.

How much one-on-one time are you able to spend with Sol?
Would you want to try taming/bonding with him?

Do all of the cages meet at least the minimum size requirements for two budgies?
Do you have yet another cage in which you can quarantine a new budgie for 45 days away from the current budgies if you choose to get one?
Do you have the financial resources necessary cover any unexpected Avian Vet expenses?

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