Do all fish recognize cleaner shrimp?

[leafyseadragon]

I have a royal gramma in a tank with a cleaner shrimp. The shrimp waves his feelers at the shrimp and moves in towards the gramma, but the gramma quickly swims off the other way. I had a clown who didn't like to be cleaned by the shrimp, but it just ignored the shrimp instead of running away.

I thought all fish welcomed the services of a cleaner shrimp, if not just ignoring it. Is my gramma unnaturally shy?

[MT79]

IME only larger fish (ie. tangs, angel fish, etc) will take advantage of the shrimp's services. I've never saw a clown or gramma allow a Lysmata shrimp to clean them.

[saltcreep1025]

I've never seen one of my fish get cleaned, only my fingers.

[quarryshark]

IME only larger fish (ie. tangs, angel fish, etc) will take advantage of the shrimp's services

Agree, same thing with my stock.

[IworkatPSP]

Only my hippo tang and oddly enough my hawkfish go to the shrimp for cleaning. My hawkfish is an idiot.