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Tangs are herbivorous. As Hara said, I think you'd be OK with any of them. Some tangs get really large though so be sure you have enough tank to accomodate them as adults.
gt i think tangs are reef safe it was a very old book which is why the ugf was recommended i think the only real problem with the tang is having a tank big enough and not mixing them with their own kind.
i had a pacific blue tang and a yellow tang that didn't get along well enough.. lucky they didn't have those spines... i had to get rid of the blue tang..
together?? i mean they are both of similar shape.. there's always a chance for fighting.. try to go for fishes that are different in shape and size.. i think you can put them together though if you introduce them at the same time..