I'm hoping for some advice, I'm a rabbit novice and in over my head here.
I have two spayed female rabbits, Marshmallow and Coco, who hate each other. Before Marshmallow was spayed I'd bonded her to another unspayed female rabbit, Pancakes. That went pretty smoothly, I'd put them together in a neutral space for about a half hour every day and if they fought squirt them in the face with a water gun and they'd knock it off. After a week and a half of that they started grooming each other, and soon they would spend hours a day together licking each other and were so sweet together. Unfortunately after only a few months Pancakes became sick and died, I was never really sure what exactly happened. After a few months I decided to get another companion for Marshmallow.
Coco was spayed already by her previous owner, and when I put her and Marshmallow together they fought like crazy, it was nothing like with Marshmallow and Pancakes and the water gun did nothing. I decided to get Marshmallow spayed. 3 weeks after she was spayed I tried putting them together in a neutral space again, they fought like crazy again, there was fur everywhere, one of them screamed, it was awful. I decided I hadn't waited long enough after the spay and I would hold off on putting them together again. Now it's been two months since the spay, they have cages next to each other, they swap cages every night. The other day I put them together again, this time armed with a rake to separate them if I need, and they fought like crazy again. So much fur everywhere. The water gun again did nothing, I'd use the rake to separate them, wait for them to calm down for a minute or two, lift the rake up, and they'd be right back at it again. After 15 minutes there was no improvement so I put them back in their cages.
I don't know what to do now. None of them has actually been hurt besides fur getting ripped out, but I feel like one of them easily could be. I want them to get along, before I had the one rabbit cage door open all the time with a dog pen clipped to the outside of it so Marshmallow could have some space all the time to roam (she didn't make a good free roaming rabbit, too much cord chewing and pooping behind the couch), but I don't have enough room to do that with two cages so now they're both shut in their cage all day unless we're there to supervise and let one out at a time. But I'm kind of afraid to put them together again in case they do hurt each other. I'm hoping for any advice you could give.