If you have reverse osmosis , the problem is solved !
I would keep things very simple , use an all purpose chemical fertilizer with trace elements, from a garden centre .... nutrient formulae don't have to be precisely tailored to a specific plant ,the plant just won't eat what it doesn't want ...commercial greenhouses taylor nutrients because they don't want to waste fertilizer ... on a small scale this doesn't matter ..
This and the right Ph cannot fail.
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