Earlier today, I walk out of my room to find my Honey Gourami lying on the substrate, not moving. I put some food in and tried to wake him up but he was dead. We believe that he either wasn't eating properly or had some prior disease when we bought him. We want to make sure that our 7 HarleQuine Rasboras stay alive but we also want to add another type of fish. It can be a centrepiece fish or some sort of schooling fish.. Any ideas for a 10 gallon tank?