I was able to open the videos.
The emperor angel has mucus plugs. The queen angel is different, see how the lesions are eruptive, coming from under the skin? There is an internal fungus disease that can cause that called Ichthyophonus, but it isn't treatable. I have seen it go away on its own. The Queen angel might have that.
Here is some information I wrote about mucus plugs:
Skin mucus is normally invisible, but under certain stressful conditions (often caused by water quality issues, parasites or bacteria) the fish’s mucus production ramps up and the mucus coating thickens and becomes more visible. This can be especially notable over the fish’s eyes, or on dark portions of the skin. This can lead the aquarist to make the false assumption that it is only the eyes, or dark portions of the skin that are affected, when actually, it is just more visible in these areas.
Idiopathic mucus plugs/cones: Fish sometimes develop excess mucus that excretes from the producing skin cells and rather than spreading out along the body, rises up as a cone or a plug. These presumable develop from some sort of skin irritation. If you do a skin scrape on them, all you see is mucus. They do show up on dark colored fish more often, probably because the contrast makes them easier to see. The cause(s) for this is unknown. In some cases, they just go away, in other cases, the fish dies - but in those cases, it is probable that there was a secondary issue. There may be some correlation between copper sulfate use, or a reaction to a previous skin infection. There is also some strong correlation between this issue and the species of fish; surgeonfish, tetras and Anabantids are all known to develop this. Many people misdiagnose these mucus plugs as Cryptocaryon or Lymphocystis, but the plug or cone shape to the mucus is diagnostic to some degree.
Jay
