just as a forewarning your gouramis may become quite aggressive the bigger they get. when i first started i started adding gouramis, i had gold and opaline and the opaline grew bigger faster and a lot more dominent. both were females. then i took out both of them and started over with a opaline, gold, and pink kissing, pink and opaline were females and gold was a male and i noticed a lot of aggression towards each other in my 55 and towards the other fish. at the time of gouramis i had green, platinum green, albino and tiger barbs, i had lemon tetras (which got along fine with gouramis but not barbs) figure 8 puffer (which terrorized the gouramis) and i noticed that the gouramis and sharks nip back and forth. i did also notice that the pink kissing gourami is kinda passive and got picked on by the gold gourami too. just thought i would tell you my experience with them