FWIW, there have been MANY tang "police" threads and for the most part they are constructive except for a few people on both sides who have nothing to really contribute, IMO.
I am sure your reputable saltwater dealer would be more than happy to sell you whatever you want. That is the point of the business.
But to start a thread with the INTENT to do nothing more than cause trouble is marginal, and not a welcome behavior. THAT is the problem here.
Now many people in this thread have posted productive comments, including myself frankly. If you choose not to consider them that is fine, but I encourage you to change your mind.
FWIW - Just to give you some background....
I have a pretty reasonable amount of experience with tropical marine ichthyology (fish behavior, ecology and systematics) including teaching. I have a graduate degree in marine invertebrate zoology specializing in echinoderms, and worked for several years in both the LFS and public aquarium industry.
**BUT** I don't know it all, and would never say I do. There are you are definitely wrong. And I will be the first to say that having a degree in marine biology buys little in this hobby. Totally different worlds, and in fact I battled the marine biology stigma through my time in the aquarium industry. Often marine bio types come with big attitudes, very apparent in this hobby actually, and often have a lot to learn about this totally different line of work.
But I will not promote what I think, and to some degree know from experience, will not work or is in some way marginally ethical.
People are more than allowed - ENCOURAGED - to have constructive debates on the husbandry of tangs and other fish. I am not a card carrying member of the tang police by any means, and think both sides have something to learn about debate.
IMO, sometimes you do need to listen to others, if for no other reason than you will be wasting your money.