Okay guys, this is my first post so bear with me... I noticed something interesting in the tank tonight. I saw my yellow watchman goby hanging around the main burrow of my red banded pistol shrimp. This was moderately exciting because they haven't paired yet. (The goby has been hanging out on the other side of the tank for the most part). My excitement turned into curiosity though as i saw the goby open his mouth and gills, as if he was injured (i know hes not). Then I realized the pistol shrimp had his legs and claws in the goby's gills. It looked as if he was cleaning or scrapping something off of him. I have never seen or heard of this behavior before so I was hoping one of you knowledgeable folks could help me decipher what the heck is happening! I've attached a video as an example.