Blue dot sting ray question

I just bought the tank so for fish I was thinking a blue tang and I was reading that there is a fish that cleans the sting ray but I can't find the article anymore dose anyone now the name of the fish

Cleaner shrimp climb on top of my rays and clean. I have cortez rays. Easy to keep.
 
Blue spots due. Cortez and Yellows handle not perfect water much better due to them being found in areas with some nasty stuff.
 
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