Or just monitor your no3 and po4 daily to make sure they don't go out of hand while u fix your mg ca and kh.
Base on your mg ca and kh reading I would suggest u dose kh. Instead of seachem(I never use before so I don't know what is it) try using some sodium bicarbonate. If u need I can pass u some to try and see if it can help u increase your kh
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