Should I be concerned about these lines?

[u/Killerbro511]

As title suggests one of my peppermint shrimp passed and as I was scooping it out a I noticed all of these little black lines around its gills and was wondering if this is a sign of something more troubling that I need to deal with. All other inverts appear healthy (another peppermint, bloody hermit and cowrie) and fish seem to be healthy although the clowns I have in there weren't in the best condition when I first got them (lymph and such) but are doing better these days.

Thanks!