I have a pair of kissing gourami's... The one is doing fine, but the other one is sick. He just sits in the lower corner of the tank. It looks like he has a dark spot by one of his eyes. All of my other fish seem to be doing fine. Any ideas on what this could be, or it will eventually affect my other fish? Do you think I should move him into a tank by himself? I have never had sick fish before, so I really have no idea what to do? Any help would be great