I once had 2 gold gouramiis. They are violent fish. One of my pushed my other actually into and up the filter pipe! This was in a 20 gallon. I got more to cycle my 55 gallon and although they were less violent, they still fought each other. I recommend a more docile species of gourami,but if you can't, you definately need more ornaments to block the bully's line of sight. Some plants or driftwood would work.