Two tangs max. I would say in your size tank (hope you plan an upgrade).
The box I would build would be at least 1' x 1' x 2' in order to fit into your 90g. A bit bigger would be better.
Go with Purple. Powder anything tangs are terrible ick-magnets. The stress will likely cause a big outbreak that will kill at least the Powder Brown.
Same shape yes, but the isolation chamber worked for me to get a school of 6 YTs in my old tank years ago, one at a time.
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