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It is very common for pairs to fall out & being to fight, the stress of a new home & a larger cage can both be factors that may trigger it although it will often happen anyway as they get a bit older & want their own space, pairs generally do better in smaller cages as they have less to become territorial over.
If they don't settle very quickly I would either move them to a smaller cage or preferably separate them before things escalate & serious injuries occur.
They live very happily alone & it is much more natural for them to live that way.