[flowerfairy]

Littermates are not guaranteed to get along. My advice would be to go to a reputable rescue and get a bonded pair. I impulse bought my two bucks from a local pet shop then had them castrated. They fell out and had to be rebonded after having a few weeks apart (no sight, sound or smell of each other) to forget their fight.

Meanwhile I had adopted a pair of does from a rescue. I bonded the four of them together. It was amazing. In future, if I ever got more I would go straight for a ready bonded rescue pair, waaaay cheaper and less stressful!

Sounds like you are an enthusiastic animal lover.