Apisto Death

[Len/Geo <szucs@total.net>]

Hi

My female apisto.cacatuoides died yesterday. She had no visible sign of
disease. I did check ammonia, nitrate, nitrite.. all`s fine.  Still have
the male in the same tank.  He stays on the  bottom, hides alot, don`t
see him eating and does have Clamped fins.
Is this some sort of bacterial infection?  Is there anything I can do?

Thank You
George