Yes, I would consult a behaviorist if you plan on keeping them both. If they're already in a fight, are near each other the e-collar can escalate it. Dogs can associate the e-collar correction, as coming from the other dog. This is even for ones that are e-collar trained. I don't know any trainer worth a grain of salt, that would tell you to turn the collar all the way up. Or even up very high. They can start associating you lighting them up with a collar, when one gets near the other. That's going to lead to a whole lot more stress between them, and more problems for you.
There are a few trainers, that can overlap e collar conditioning for aggressive behavioral problems. They are few and far between, and its not something you would do on your own.
If your breeder had a lot of knowledge, they never would have sold you two puppies from the same litter. Professional trainers, and breeders, sometimes own littermates. But for the average person, it's not a good idea.
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