Whenever a fish separates itself from its tanks mates it's an indication of a stressed fish.  If the fish is hanging in the upper corner chances are its being harassed and chomped on by a grumpy mug like the Frontosa in the picture.

Compatibility in a community tank can sometimes be tricky.  Even fish that are generally compatible can fight during spawning or just to show who's the boss.  Rearranging the decor in the aquarium is sometimes enough to calm things down.

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