I have 2 dwarf gouramis. One is blue and the other orange. The orange has dropsy and can't swim well. The blue gourami is chasing him sometimes and biting his fins. This has currently been happening for about 4 days. The orange gourami doesn't normally chase the blue back. I have plants floating at the top but that doesn't really help. I want to save my orange gourami but I don't want to kill my blue or cause stress to him. I can't return him. What should I do?