It’s impossible to keep ALK at 9. I find myself always on the higher end 11-12 / 180-198
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I never added ALK and I use Red Sea Coral salt which is 12dkh. I may be switching to Fritz’s reef salt. But may have issues dosing micro nutrients not having test kits for those.
I use a lot of Red Sea products. Red Sea also have another salt but mag and calcium are much lower but I may have to deal with that over higher ALK levels
I meant to text trace elements.I'm not sure what you mean by micronutrients (that's not really a seawater/oceanography terminology) but I would not dose nutrients without either a measurement, or an indication from an organism that it was suffering and you had strong reason to believe a specific element was needed.