I never had the vampire tetra with my arowana and endi birchir and spotted gar but I'd assume my arowana would've picked on it but as for the other fish they did fine! As long as they were all fed (especially the arowana) their wouldn't be any competition for any food! Plus the gar and endi birchir has some pretty tough scales so whenever did the jardini nip it didn't do no damage to them whatsoever !thanks for looking!