I have followed EI dose for couple months. The plant seems like it. However, I found some problems recently. There are some black on the leaves(BBA?). There is green algae on glass. Yesterday, I tested my NO3 and PO4. It is very high! NO3 about 60ppm and P about 10ppm. I am not sure if there is some problem of my test kit. But I used this test kit for a while. It never read N and P such high. I use Tek 4x55w on my 100 gal tank. pressurized CO2. heavily planted.