I had a Golden Gourami(Only Small) along with 6 Harlequins and 2 bronze corydoras. I was instructed by my local pet store they would all be fine in my 6/7 Gallon (30 litre) Tank, everything was fine for 3 months and then i noticed the Gourami starting to take interest in the little harlequins, i then thought, if it kept happening, i would return him, the next day when i came home from college, i returned to a war zone, i had 4 dead Harlequins, 1 seriously injured (he has now recovered to full health), and 1 hiding for its life, but the strange thing was the little bronze corydoras where fine. Is This normal behavior of a Golden Gourami? Or is it a freak story?