How to keep a wrasse with a clean up crew?

They are useless for pest control.
Are there certain wrasses who are good for pest control but dont eat inverts like snails (aside from the melanrus/coris - they eat cuc, and six line - aggressive)?
 
If its going to eat pests effectively it is a risk for cuc. Pink streak and wetmorella wrasses are safe w/cuc and will eat some pests, but aren't super effective.

Halichoeres chrysus is relatively safe w cuc and is very effective at pest control.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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