My ornatus wrasse decided he liked shrimp after being in a tank with 4 cleaners for about 8 months.
I had a six line years ago that killed cleaner shrimp for their eggs.The eggs were its primary target anyways.
Basically, wrasses are unpredictable.
My neon dotty is afraid of its own shadow but, I think it would drum up enough currage to take on a little shrimp.
I wouldn't trust any dotty's with shrimp myself.
Jeff