frantic swimming

I just got a new coral beauty angel a couple of days ago. He was doing very well until today. He has been swimming frantically up and down the glass in a couple of corners of the tank. I also got a potter's angel the next day. They are the same size and seemed to be doing well together. everyone else in the tank seems to be doing fine. I'm getting water ready to do a partial change. Any advice? Is he just trying to establish his territory?

thanks

 

Might be trying to find an escape route or maybe likes what it sees on the other side better.