1 tablespoon per 50 gallons every 2 weeks.
That sure is a lot of time to spend taking care of your tank.
.I lost the sheet with the septobac dosages, what were they? I was going to get some, hopefully making my dad think I am spending another two hours a week maintaining the aquarium. He says once I take care of it more (I spend half of my free time on it), he'll look into buying a larger filter.
That sure is a lot of time to spend taking care of your tank.