RBTA Tentacles look hurt

[WarmSoda]

Something is making my RBTA look weird.

A few of the tentacles look 'bruised' or nipped/crimped.

What's going on? My hunch is the peppermint shrimp.

Nitrates: 0
Phosphates: 0.2
Calcium: 420 ppm
Temp: 80.0
Salinity: .025

Tank inhabitants: 3 peppermint shrimp, one clownfish (not hosting), and one orange spot goby.

 

[mariobrothersleeve]

It looks normal. They should open fully and close each day.