Originally Posted by s_s
Shrimp and cardinals and mollys and rummynose? 7 gallons?
You're likely overstocked. How high is nitrate?
Nitrite and ammonia are both 0. I believe water condition is ok as the colour of both rummy nose and tetra are very vibrant. They seems to hide among the plant most of the time. I suspect they are stressed due to the strong current from the filter. I now places a spongue at the filter output to brake the current and they seems to come out more.
I am not sure the death are stress related? Any comment?