There is a fine line between healthy nutrient poor tanks, and unhealthy nutrient poor tanks. Most AF users strive for .2ppm NO3 and 0.00 PO4, this allows the user to feed a heavy bioload without concern of elavated nutrients, but maintaining ample food supply to fish and corals. That said, I personally prefer NO3 @ or under 5ppm, I am usually 1ppm on Salifert. The nitrate available in my tank comes via heavy frozen food feedings, and that of the entire supplement dosing from Aquaforest, mentioned above. Depending on your bioload and your skimmer performance, using AF Probiotic Reef Salt, and AF Pro Bio S(Bacteria) and AF NP Pro(carbon source), together may keep your nutrients low. However, with a larger bioload, like myself, I utilize siporax and matrix as additional medias to colonize bacteria, which aids in reduction of N&P. This media is unrelated to AF, but many users like it because they can use little live rock and still have the biological aspects. I also use AF stacking method, which includes using 3 additional medias available in the AF Probiotic lineup. I use a zeolite reactor, but any fluidized reactor will work. I place in the bottom AF Zeo Mix, then on top of that I place AF Carbon, and on top of it I place AF Phosphate Minus. The set rate flow rate is so that the Phosphate Minus tumbles gently, but not to escape the reactor. This setup is simply changed out every 4-6 weeks based on your tanks bioload, I change every 4 weeks. Having this in the lineup is kind of my way of perpetually controlling nutrients and keeping them low, this allows me to feed my very fat healthy fish several times per day, I have 5 anthias... The fish poo then becomes a food supply to my corals. I use LRS Reef Frenzy and alternate with PE Mysis. Additionally, I use AF Amino Mix, AF Energy, AF Vitality, AF Build, and AF Powerfood. Running products from Red Sea in conjunction with AF will not guarantee success, as they are not formulated together. Personally if you switch, I would discontinue the dosing of NO3 as well. Hope this helps
Cheers!