Hi Mystic,

Your (dead) fish was a Nimbochromis Venustus, a Hap cichlid from Lake Malawi. That 'flat looking head' is a deformity, which could have contributed to his 'fit' & subsequent death.

As for other reasons to 'suddenly go jumping around & dying' ... well, it's possibly he was terribly spooked (either due to aggressive tankmates, tank decor/changes, or some other reason).

Sorry about ur loss (but look on the bright side: ur fish rests in peace!)

__________________
~ John ~
I am a Malawi Fan!