Bumps and "itching" on tang

Just received 2 blue hippo tangs and a bubble tip anemone in a shipment. Had them about a week. Now that the tangs are comfortable enough to come out in the open i've noticed bumps on the bottom side of the larger tang and he is itching on the rocks. I assume its a parasite of some sort. And i did have a cleaner shrimp in my tank up until i got this shipment... now the shrimp is missing. What's the next best way to take care of this issue. Would a freshwater dunk help? I'll include pictures, though its hard to snap a good one of a moving fish
Thanks, Eric

 
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