Normally my two get along pretty well. I mean sometimes they annoy each other by poking each other's butts or mounting behavior, but after I cleaned out their cage this morning they've been fighting the entire time. And it's not like usual, they're getting in each other's faces and one of them (Sugar) has been squeaking nonstop. I would have thought they'd get tired by now, but it's still going on. They don't seem to be actually hurting each other, though at one point I saw what looked like an attempted nip. Should I separate them? Cleaning out their cage doesn't usually cause fighting like this and I didn't do anything unusual today.