I recently had a dwarf gourami die so I bought another one on Friday and he seems to be on his way out today. He spent most of the day so far in a vertical position on the bottom of the tank and is now on the bottom of the tank upside but still breathing. My water parameters are ammonia 0, nitrite 0, nitrate 5, temperature 76, and pH 6.6. I did not witness any bullying in the tank. As far as my research goes these parameters should work with DGs. Does anyone have better knowledge with DGs and can tell me why they are not lasting?