Weird red markings on gills of yellow shrimp?

[yeva]

This week I noticed that some of my yellow neos developed white patches on their gills. I quarantined them as soon as I saw something was off. As the week went on the patches got a red edge, and almost look like blood? Both sides of the shrimps are affected (slightly symmetrical), and the edges seem to be darkening. It doesn't seem like Rust disease because it's localized to the gill area, so I'm stumped on whether they just got unlucky with some water parameter changes, or if it's something serious? I've browsed the diseases topic and none of them seem to match. They're also eating/acting fairly normally in the quarantine tank. Would appreciate any advice! I've attached a photo below. 

[jayc]

That's rust disease. Looks like the bacteria has eaten through the carapace.

Edited January 18, 2022 by jayc

[yeva]

cool thanks! guess i'll keep trying the oregano oil and hydrogen peroxide ;_; fingers crossed