would two purple tangs be okay together

[naesco]

Originally Posted by Marlin65

Its a 3 foot x 3 foot tank that means the foot print is bigger than most 120's Last time I checked tangs swim back to front and side to side not up and down.

Tangs are swimmers and it is the length that is important not the volume and for that reason I would not recommend keeping two or three of them in a 3 foot tank.
Some fish like angels, kind of 'hang around' and for them volume is important not the length.