Agree, Not only this and extra food is fine, but say you have bristle worms, hydroids or a vermited worm issue (who dosent?) Now your helping them survive and possibly thrive. If you are trying to get n03 and p04 up why would you not just add what you need, instead of adding food that will one day turn into what you need. Also food can be more expensive than diy additives, its just a different way to achieve what you want , but what side effects come from each method is really the question for me.