Hello,
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!
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My Tank Setup
75 Gallons
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.