Is this shell rot?

[TysFish]

Hey everyone, looking for some advice from mantis shrimp owners or people that are knowledgeable of them.

I have a peacock mantis shrimp and noticed a lighter/whitish patch on the tail segment near the back. This is on the exact same spot on both sides of her tail. I just wanted to get some opinions on whether this looks like early shell rot or something less concerning (like a scuff, molt-related change, or normal wear).

I attached a close-up photo, the spot is on the tail fan area.

Some context:
- Tank is a 40 breeder
- Currently fighting Dinos
- She’s been in the tank for about a month and a half now.
- She is young, about 2 inches long
- She’s very very active, especially at night, eating, smashing, and behaving normally
- Has been rearranging burrow / exploring a lot recently

Does this look like shell rot to you, physical damage / pre-molt changes, or is this normal? If it is shell rot, what would you recommend doing at this stage?

Appreciate any input, just want to catch anything early if it’s an issue.

 

[TysFish]

Here’s another photo

 

[Stomatopods17]

No. This is a common for O. scyllarus colormorphs.

Occasionally half the setae on the tail will also be mirrored white.