I'm quit new to the planted tank hobby and i have been having problems with plants deficienes. I can,t put my finger on the problem. The tank has colombo aquasoil and gets dosed Pro jbl flora ferropol and easy life iron every week. I also inject co2. I change 30% water every week. These are my water parameters:No3 0 ppm, No2 0 ppm, Gh 7, Kh 6, Ph 6.4.