Look at it this way… your tank needs bacteria and an established biome. This is what will consume nutrients. Long term is also what help keeps NO3 and PO4 in check. If you have a strong base of bacteria, it is what will consume the nutrients, along with what the corals will consume for their own growth as well. This bacteria is established in a few ways… established live rock, bottled bacteria, fish and food waste, etc. You started with dry rock which is the most sterile way of beginning what is otherwise the most complex environment we likely know of on this earth. It takes time, patience, and essentially is a battle ground for all these microorganisms to outcompete each other. If your biome isn’t diverse enough to outcompete the algae, then the algae will continue to win. Now, by adding pods, you’re adding life that consumes life, also more waste, and in turn more bacterial load. By adding live phyto, you’re adding more life and diversity, and also adding a food source for the pods. You can (and should) also feed more, and/or get more fish if you’re not packed, and also get that Tuxedo Urchin! Yes, all of these will increase PO4 and NO3. Yes, the algae will need to be manually removed on a constant basis. Yes, this is a long process that requires a lot of work and some wet hands a couple times a week. But- the excess PO4 and NO3 will be the fuel for your biome, and in turn will slowly start to outcompete the algae.