So I was cleaning my tank and I just noticed these weird stains. Almost looks like water stains but I can’t figure out how or why. Anyone have any clues or ideas and how to get rid of it? I tried to clean with my glass float cleaner with metal blade and tried pad. It is not on the exterior of glass. They are only really visible at the right angle which is how I noticed it after swapping my filter socks. Pls help.