Well, I don't think either tang is suited for a 46G bowfront. But if you were going to disregard the advice given....definitely don't put a Regal Tang in a tank that size. A yellow would do *better*.
I don't think any tangs are really suitable, to be honest.
Dito. Tangs need 90g or more!!!!!!!!!!
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One more fish should be ok?, right!!! - Laurie