blue hippo tang

This morning I noticed that my hippo is favoring one fin. I can’t tell if he is injured or has the start of a fin disease. video is long - around the 2 min mark is a good shot. I was videoing the Anthias as well. He was introduced to the tank a month ago. He came larger that I thought he would...

Okay, so my niger trigger and my blue hippo tang keep putting their bodies up against the rocks and just laying there, is that normal or is something going wrong? All my water perimeters are fine.