When i was more ULM if i didnt feed super heavy i had to dose both. now i run at .07-.08 p04 and 7 nitrates and dont worry to much about it. i still run a chaeto driven fuge as well.
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I suggest that this calculator is a good one to use:
I recommend food grade sodium nitrate (or a little less desirably unless you measure potassium, potassium nitrate), and sodium or potassium phosphate. For the sodium entries in the calculator, use the potassium entry and just use a little less (exact dose isn't critical anyway).
I'm not a fan of the products sold by hobby companies that do not include any recognized purity grade on the product.