My yellow tang recently developed some spots on his fins and I suspect it might be ich. I quarantine or buy from Dr Reef, so not sure how it got in and am asking for a second opinion before I start treatment in case I am going down the wrong path. The tang does have some fin damage, but I believe it was caused by my return pump being set too low for a few days before I fixed a plumbing issue. Since then, I have fixed the issue and added selcon to its diet and the fins are greatly improved, but now I am dealing with some white spots 
Attached are some pictures and a video, here is a link to the video in case the player doesn't want to work:

Attached are some pictures and a video, here is a link to the video in case the player doesn't want to work:



