I have a 75 gallon high tech planted tank. I do ei dosing plus add dtpa iron chelate just before lights turn on and the ph is around 7. Co2 and water flow seem to be sufficient. My tap water after I've aerated it over night is ph 8, gh 37, and kh 33. Crypts and swords seem to do alright but I've never had much luck with stem plants. They all seem to grow stunted. Is my hard water to blame for this or is there still something I'm doing wrong.