Recently I have adopted a bun for my current one Winter. We took her to our shelter and had a few dates. Eventually we decided on a adult female that Winter was the most comfortable around. They both sat next to each other and groomed themselves and everything. I expected a little tension once we brought the new bun home but this is rediculus. When we put them in the tub together they huddled and actually Bunny (the new bun) groomed Winter for a moment. However everytime we take it to the next step of being on the floor spereated they would attack eachother through the bars. It has just escalated from there. Winter has no incisors so thank god because if she did Bunny wouldn't have any fur left on her bum. I just am at my wits end. It has come so far as to each bun is seperated at all times and the one time that we tried the tub again it was just a fur ball fight. What can I do to atleast ease the tension? I am prepared to live with 2 buns seperated but it would be nice to atleast be able to have them both out seperated by a barrier without them trying to rip eachothers fur out.

I am sorry that things have been rough! 

They're both spayed, so that's already covered. The only things I can think of right now is maybe try the tub again but use distractions. Do they have favorite treats like banana? Sometimes food causes aggression but I found that it had the opposite effect on my bunnies, I made sure each had a good pile in front of them.

Also, have you tried stress bonding them? Are they scared of the sound of the vacuum or music? You can also try putting them in a carrier and driving around in the car.

Hang in there! I hope something gets worked out soon. I'm sure others here on BB will have some good advice for you.