First post here, I'm a novice to fishkeeping. I've got an aquarium with a koi and zebra angelfish, and two female threespot gouramis, one is a wild color form and one's a golden. My books on fishkeeping say the males are aggressive towards each other, but not females. I added the golden one first with the koi angel a while back, and recently added the wild blue with the zebra angel. The angels are fine, but the golden gourami has been charging at the slightly larger blue all the time, which I suspect is territorial issues. I'm currently keeping the aggresive gold seperated with a floating plastic box, but I don't want to keep it there for long. Anyone have suggestions on how to reduce its aggression, or must I get a seperate tank for it? It's pretty stressful on both fish (and my brain), even while seperated. Any suggestions would be appreciated.