Ok so a week ago one of my sugar gliders(2) (who have been fine for a year and a half) started crabbing to the point that it woke me up so I went to go check on them. I walked in on my other almost biting him like as if he was grooming him. But just to be save I separated them. Then last night I put them back together and it happened again. Is this normal, are they grooming or are they fighting. Please help me.