For mead staggered nutrient additions (often referred to as SNA), the most common ingredients you will see mentioned are Fermaid K and DAP. Basically, you want a yeast nutrient (like BSG superfood, Fermaid K, Fermax, Fermaid O, etc.), but since honey contains very little nitrogen you also need additional nitrogen supplementation (i.e., DAP). This would be in addition to the amount of DAP that may already be included in the yeast nutrient. Fermax is fine to replace the superfood in your recipe, but you probably still want to use some DAP in addition to it.