What makes a Midas Blenny have these spots

[hawk82]

This is not mine, just a picture I found online. But see those pinkish/redish spots on his body, mine has a spot that color near his tail. At first I thought it was a sore, but It dosent seem like it, and he appears to be acting and eating normal. Do they just get weird colors and spots on them?

 

[vetteguy53081]

Looks like aggression. Nipping to be exact. To find the culprit, set your phone on video mode for about an hour and even drop a little food and walk away.
Come back and review video and you’ll see the culprit