Ah Fenner, the king of "take it with a grain of salt". I do enjoy his site and his humour (or lack thereof) but I personally don't trust his judgements on fish - back when I was researching livestock for my tank, he told me to go ahead and put three marine catfish (Plotosus lineatus) in my reef. Suuuure Bob, they'll be great after they grow to a foot long and eat everything else I own.
As for the tangs, I think with two in a 90 gal, well, space would become a concern at some point in time. You'd want to ensure they have lots of room to swim, as I suspect this is a major factor in how well tangs (and any other fish) do together. Purely anecdotal evidence (there's my disclaimer), but I'll cite Steve and his clownfishes, and this month's AAOM tank of the month, which contains at least five species of tangs from the genus Zebrasoma.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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