I just recently got a Channa Obscura a month ago. At first it was doing fine, eating and swimming. For the last week it's been acting differently and not eating. His eyes are looking really dark as well. For the past few days I could not find him but I found him hiding next to a piece of driftwood. I moved it and he didn't really swim away, just laying there. I know he's still alive cause I can see him breathing and moving. Anyone have any idea what could be wrong and what I shoudl do? Any help would be appreciated.