depending on the species of giant gourami you have to be careful. some get very large and very aggressive. my local public aquarium has a few that are absolute monsters and rule a 30' asian riverine paludarium display. ill see if i can dig up some pics. i have kept gold gouramis with my delhezis with no issues. ended up losing the golds to a dat that really hated other gold fish though. have also had great luck with snakeskin and kissing gouramis. I think snakeskins get overlooked far too often because of their blander colors, but wow! they are super fun and unique fish that i would recommend to anyone who enjoys gouramis. my girlfriend keeps super powder blue dwarf gouramis and i use their tank as a growout for polys lol, grew out my ornate and hybrid congi in their until they got big enough to pose a threat to her prized tiny blue fish and they got evicted haha