I agree, try the sump or a QT tank for a few days or a week.
Both sets of my old Ocelaris both orange and black were nice. The largest female got kind of aggressive towards the blenny when she got about 4 years old, but only when he tried to sit right next to her bta. She didn't mess with me at all and would eat food out of my hand. She was also nice to the male and any other fish unless they got right next to the bta. The blenny was the only one who ever did. He had his own rock but would wonder over there and she'd let him until he got too close, like about an inch or two away.