My tropical fish tank has suffered it’s first fatality. I purchased a small gourami about a week and a half ago and its introduction immediately produced a violent reaction from the kribensis. I isolated the kribensis for a few days and it seemed to calm down after that, but last night I came home to find the gourami had been savaged and it died shortly afterwards. Five weeks without a fatality is still better than I did when I was a teenager (my first fatality was within twenty-four hours when a swordtail managed to jump through a hole in the cover).
I love the kribensis, she is a really wonderful fish to have in the tank, but they’re a bordeline species for a community tank. She leaves all the other fish alone, but in hindsight this gourami was the wrong fish for the tank, too slow to escape and too small to defend itself.