I think that your tang will be fine. M understanding is that unless you have a large tank(100 gal
+), you should only have one tang in the tank. However, if you chose to get another tang, you have to make sure that it has a different body shape than the Yellow Tang otherwise they will fight. Cheers!
My Tank Setup
Prizm Protein Skimmer
Fluval 304 Cansiter Filter
Hagen 802 Power Head
2 Hoods. One with 2 Blue Actinic 03
Bulbs and another with 2 Power Compact White Lights.
75 Lbs Live Rock and live sand.