Two things about that - first, what we've been told is not to keep two tangs in the same tank together unless they are very dissimilar in appearance. Second, look at the mature size of both of them. Our tang is supposed to get up to 14" at maturity. Two tangs in a 55 gallon are probably too much.
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"Well behaved women seldom make history." Laurel Thatcher Ulrich
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