Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
EI includes nitrogen fertilizer.
If you did not use the nitrogen component, then EI would work.
Get the single ingredient packages, not any combined product.
Flourish Comprehensive contains a very low dose of nitrogen. Sure, that is one way that N is entering the tank, but I think the major source is fish food.
With the plants not doing so well, I think that the fish food is contributing too much N.
If this is true, then there is also reasonable levels of P and most traces entering the tank from fish food.
I would dose potassium and iron only, and carbon. These are the elements missing in fish food. See if the plants perk up. Continue with the Comprehensive, if you want, but at the lowest dose.