Agree with above comments, though you may be fine short term with 3-4 Tangs of different species longer term I'd only suggest maybe a Yellow along with a Kole or Tomini. Even these smaller Tangs are not best kept in smaller than 120-150g DT's as they will get bored and aggressive with such small territories. I have five Tangs in my 125g, two of which need to be upgraded to larger tanks already and eventually all will be in a much larger system.
Cheers, Todd