Can you tell us the context in which the "fights" happen?
Does it happen mostly when they are eating or when they are getting ready to sleep for the night?
From your description, it seems at this point what they are having is light bickerings. This can be reduced by having twos of everything in the cage (two food bowls, two same type toys, etc). It's important that you continue to keep a close eye on your girls and pay attention to their behaviour and interactions. Once they go into breeding condition, you will have to double up your watch on them and be able to decipher their body language and behaviours so that you are better prepared to act in case they really need to be separated.
Only if you start to notice and escalation on the bickering (turning into a real fighting situation) and there is more consistent chasing and heavier pecking between them (the pecks will usually revolve around the head/neck/face areas), then you will have to house your girls in separate cages.
If there is feather plucking during a fight or if they happen to lock their bodies into fight while at the bottom of the cage, they will have to be immediately separated.
Those are pin feathers that are in the process of opening up.
From the photos it appears that the new feathers are already coming out of the pinnies and once they are fully out they will not longer be sticking out in that manner. This is all very normal and part of the moulting process.
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