Well I don't see anything that looks bacterial and only white markings that are common to them and sometimes are more prevalent than other times just like they can change their coloration to suit their moods or security.
If you see what looks like in this picture you will most definitely have to treat.
https://fusedjaw.com/diseasehealth/f...osion-disease/
If you determine for sure she will not eat, you will have to tube feed her.
https://fusedjaw.com/diseasehealth/e...-tube-feeding/
Tami likes to sedate first but for me, I believe the more sedation, the shorter the life span of the seahorse but I don't have proof to back up my thoughts.