My community tank has gone insane ever since I added my new pair of swordtails. My gourami is going completely INSANE on them. What should I do? The gourami is a blue gourami and the swordtails are like black and greenish. He is smashing them into the glass and ripping off their scales and biting their heads. What should I do? I have no open tanks. I just have 1 gallon jugs that I use for water changes. I am definitely returning the swordtails but I have to wait until tomorrow because my lfs is closed. The gourami was all peaceful and nice and now he is a complete mean killing machine of death. He is even chasing my platies now. I am very worried. The only tanks that are open are my diseased bettas 3 gallon tank and my water jugs. What do I do with the swordtails for now? I just need to house them overnight to return them right away tomorrow. Right now they are just back in their bag that they came in because I don't want them killed. I have NEVER seen a fish this aggressive in MY LIFE. More aggressive than any gatf I've ever seen. The swordtails are about 2.5 inches each. I have a male and a female. Thanks!