adding tangs in 90gal mixed reef

[SeaHorse_Fanatic]

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.