CSM+B is trace powder. Where you see trace referenced in the dosing schedule, you use the mixture the recipe is for. In your case, you would use 15ml of the 1tbsp. to 250ml water "juice". Chelated iron mixture is available from Seachem or you can ask for a recipe to go with the schedule you already have. Greenleaf or Rex have powdered iron to make a solution from. Even dosing by the numbers for EI will not make up for inadequate or fluctuating CO2 that is provided by most DIY builds. A pressurized system will eventually be necessary if you use the lighting selected. You could probably get by without it if you used only 2 of the 54w T5HO bulbs. In other words one fixture.
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