i was testing my water again today....my ammonia went from 0 to <.25ppm, nitrite went from .25ppm to <.25ppm (between 0 and .25) and my nitrate went from ~20 ppm to 0..... is this common.... should i be worried????
also i have been doing 25% water changes twice a day (cleaning with the gravel vac to get all the excess waste out of the tank)