Have had the new setup running now for 2 months, and I am still seeing what I think maybe iron deficiency with new leaves looking transparent with yellowish tips. I'm running a 100 litre tank with an eheim 350T filter (so about 10x flow). Injected co2 on before lights and off before lights, with lights on for 6 hours Currently using old dry salts to does EI with 30/40% Water change weekly. Dosing the following 30ppm K 20ppm NO3 5ppm PO4 10ppm Mg 0.7ppm Fe (0.6ppm a week from TNC fe as it uses DTPA for our alkaline water) Been reading a few other threads on here regarding water hardness and how this can effect macro and micro nutrients. Added water company stats for my water, which are pH - 7.5 to 7.8 79 - Calcium (mg/l) 197 - Calcium Carbonate (mg/l) 1.97 - Millimols 11.04 - Degrees German (°dH) 19.76 - French (°f) 13.80 °Clark (or °e) Nitrate - 32.3 mg/l Alkalinity 151 mg/l HCO3 Magnesium 2.9 mg/l Mg Total Dissolved Solids 276 ppm (calculated based on conductivity measurement) Just wondering if I could be overdosing, or have the ratio wrong as I'm now thinking should I try TNC complete for a while to see if that helps. Any suggestion or assistance appreciated Steve.