i would say yes,a 90 gallon is big for the tbars which are nearly full grown.
but might not so is the GT male or female?
-how big are the other males?,if smaller it would be good because they would be sub dominate males and proberly wouldnt mate as its the dominate male would win her over.
decorate the tank with rocks, bogwood, pots and hide outs for the other males and female if the male has been drinking stella artois

, also how aggressive is your GT? i would remove all the decoration at a w/c and place the decorations in different places so the gt and sajicas are unsettled with no territory then add the other male's. i would add acouple of fast dithers/target fish like gaint danios etc.
also another common name for the tbar is sajicas, you will find more results using sajica. also enjoy them there amazing fish, i have a tiro and alot of fry anf iam getting the sajica gold side form soon

dave