I bought two sunset gouramis and one died due to a filter accident (which I have since fixed). I bought another sunset gourami last weekend, but didn't realize they are both males. The first gourami (Oscar) constantly chases the new one around the tank and the new gourami is terrified of it. It has been hiding in the corners of the tank and today I found it hiding in a crevice in an ornament. I was planning to put three guppies in the tank. Someone told me that the new fish may stop Oscar from being aggressive with the newer one, but that doesn't sound right to me. Is there anything I can do to stop Oscar from chasing the new gourami or am I stuck returning one of them? Also, would I risk Oscar attacking the guppies as well?