"croaking damsel"

i told my local marine shop about the antics of my humbug damsel... that it "shimmys" around other fish and inverts and croaks alot (which can be heard across the room!!)and was told that this is a sign of agression but that i am hearing things as damsels do not make noises. he does not fin nip and is otherwise an ideal inhabitant.. does this happen to others??

 

SHIMMYING I BELIEVE IS THE OPPOSITE OF A SIGN OF AGGRESION. FROM WHAT I HEAR IT IS A SIGN THAT THE FISH IS SUBMISSIVE TO THE FISH IT DOES IT IN FRONT OF. LIKE A DOG ROLLING ON ITS BACK. HAVE TO GIVE CREDIT TO OMARD FOR THIS EXPLANATION AS THIS IS HOW HE EXPLAINED IT WHEN MY SMALLER CLARKII CLOWNFISH WAS DOING IT IN FRONT OF MY LARGER ONE