Hi Hope someone can assist in identifying what might be annoying my clownfish. Had this fish and his mate for several years - no new fish added to tank and otherwise everything is fairly stable. He has a spot on the side just in front of his fin near the gills. Hard to get a good photo. He was off the food for a day and did not like moving that fin for about 24 hours but since then has been eating and swimming normally.
I thought it was an injury but want to be sure. Best attempt at photo attached( I swear he knows I want a photo).

I thought it was an injury but want to be sure. Best attempt at photo attached( I swear he knows I want a photo).





