I don't know how the whole tang police thing started. I have never seen any evidence of tangs being stressed in a reef tank, due to spacial limitations. The other claim that I don't understand is that tangs need high water flow.
Marine fish do best in smaller tanks (1-20 gallons) with respect to wholesale and retail facilities. Retailers that use large holding tanks (30-150 gallons) cause more fish injuries, fish-to-fish disease transmission, aggression, and trauma as they are netted.
The reef structure design is more important than the actual tank size. I agree, wrasse can cover a lot more territory in a short time tan any other fish. They have well developed swim bladders so they can dart up and down as well.
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