i've been using the pellets for 2.5 months now. i never had detectable nitrates or phosphates so i cant comment on that. what i can definitely say is that i used to have to clean the glass every other day and now i do it once a week. i also used to get a brownish dusting on the substrate which i dont anymore. i do not run GFO anymore at all and have since taken out my refugium. the only problem i seem to be having is a small cyano outbreak on my substrate. whether this is because of the NP pellets directly or because other forms of algae are limited with the pellets making way for the cyano i dont know. i will start vacuming my substrate which i never did before.
in terms of dosages. guys, the whole idea is that this is external to your tank and the pellets are only broken down with available N and P in the column. therefore, it shouldnt matter too much if you put too much or too little. the only caveat to this is that if you have high N and high P you will get a rapid colonization which may translate into rapid depletion of oxygen as the bacteria multiply.