I suspect you are short of CO2, not overdosing nitrate. If you are short on either nitrate or carbon the plants can't grow as fast as the light intensity is driving them to, so abnormal growth could be a result. I didn't see where you said how you provide CO2 for the plants.
Yea, that's the catch. I have DYI CO2 although my drop checker is reporting steady 30 ppm or so using 4 kh solution. I guess I'll settle for the growth I have now.
The problem is not CO2 in my opinion. Having 10 ppm NO3 in the tank (measured in laboratory) and high CO2 (above 50 ppm) didn't help at all. Also raising Ca from 25 to 50 ppm didn't work either. Only after decreasing NO3 doses plants returned to normal. Too low CO2 is not the case when curly leaves appear. It seems it's a myth.
@Mr. Fish
I am really happy that EI has worked for you. Bear in mind, however, that some of us have tried EI and had no luck with it whatsoever. Sometimes things appear complicated because they are. One size does not necessarily fit all. Enjoy,
Re: How to supply calcium ? 
Linear Mode
