What is this pleco behaviour called?

It does this occasionally, about once or twice a week. I thought about stress as an option but; 1. The fish has an appetite 2. It's not getting bullied. 3.has plenty AVAILABLE hiding spots 4.spends half the time visible. 5. Water quality is good 👌

And yes I know the plants are dying, I haven't figured out the vertilizer situation yet.