Since soil is 2 months old, could be macro or micro deficiency. And since your dosing the ADA's which are what? aimed pps pro? I'd jump on N n P, you seem to be doin rest of maintenance right.
Originally Posted by Seattle_Aquarist
Do you have any information on water parameters? Specifically pH, dKH, dGH. NO3 ppm?
If it is new leaves that are effected it is likely an immobile nutrient such as iron, calcium, sulfur, manganese, or zinc. I tried to find a listing of the nutrients is ADA Green Brightly Mineral but could not find it....are they possibly listed on the bottle?
My own thinking after talking to the aquarium shop is that it might be Nitrogen.
I sadly have no idea of the values pH, dKH, dGH. NO3 ppm, however I'm blowing as much CO2 into the tank as possible. Drop checker is on the upper scale of greenish, towards yellow. Fish are fine though.
It's the old leaves that turn first white from the tip and now brown. New leaves are OK.
ADA Mineral is micro elements.
ADA Neutral K is potassium.
ADA doesn't list the contents in detail, I guess it would be too easy for common plebs making their own MUCH cheaper alternatives.