Running at ultra-low nutrients will definitely affect your zoos - which like slightly dirty water.
Might consider an all-around supplement. Few out there that supplement vitamins, amino acids, etc. i.e. Seachem Reef Plus
But, unless you're mostly an SPS tank, it might just make sense to adjust your vodka dosage and let your nitrates hover at about 5. Leave a little of the skank in the water for the zoa's, etc.