I have a Female Jack Dempsey living in a 55 gal with a small Black Convict. This morning when I fed my fish I noticed that the JD was not eating. I know it's not being stressed by the convict because the two "paired" up and do not have any aggression towards each other. The tank has been running since sunday. Is this too early to be worried about it? Also before I left it was laying on its side and not moving. Please Help!