I have finally decided to try the stock solution EI Method. But have some further questions. I have listed below my water parameters and EI dosing plan. Tank Specification:- Juwel Rio 125 (33 US Gallons) with 2 x 28w T5 bulbs (on for 9 hours), CO2 and a nutrient rich substrate. Tap Water Parameters:- PH 7.2 KH 13 dKH 232.7 ppm GH 19 dGH 304.1 ppm Ammonia 0 ppm Nitrite 0 ppm Nitrate 10-20 ppm Prosphate 2-3 ppm Copper 0 ppm Iron 0 ppm EI Dosing Plan I have bought Potasium Nitrate, Potassium Phosphate (Monobasic) and Chelated Trace Mix of (Boron 1.06%, Copper 0.23%, Iron 8.2%, Manganese 1.82%, Molybdenum 0.15%, Zinc 1.16%) Solutions Macro Solution 33g Potassium Nitrate 7.2g Potassium Phosphate in 250ml Water Micro Solution 10g Chelated Trace Mix in 250 ml Water Dosage 5ml of Macro solution per 50 litres of water 2.5ml of Trace solution per 50 litres of water Schedule Sunday 50% water change. Add Macros (KNO3, KH2PO4) Monday Add Micro Tuesday Add Macros (KNO3, KH2PO4) Wednesday Add Micro Thursday Add Macros (KNO3, KH2PO4) Friday Add Micro Saturday Rest day After looking at various websites I have learnt that the ideal targets are:- CO2 range 25-30 ppm NO3 range Nitrate 5-30 ppm K+ range potassium 10-30 ppm PO4 range phosphate 1.0-3.0 ppm Fe 0.2-0.5ppm or higher Looking at my water parameters, I already have a high nitrate and phosphate level in my tap water. I was planning to cut by half the dry powders I add to the stock solution. I will also have quite a high fish load so they will produce nitrates and phosphate. Would you suggest not adding the macro solution and just adding Trace elements based on my tap water parameters? Are phosphates dangerous for fish? I have also been told that my water may have minimal magnesium in it so to add Epsom salts. I have no way of telling the magnesium content in my tap water, my water board do not even seem to know. So would it be dangerous to fish and shrimp to add epsom salts? I take it its going to be a bit of trial and error, I understand that it is dependant on a number of factors eg lighting, fish load, filter media, plant stocking level. But if you have any further advice or notice anything I should change please to tell me before I embark on my EI method journey.