I tried biopellets, denitrate, and now I use nopox. Ive been using nopox for months with excellent results, I had none of the negative results like I did with the cyano from the biolpellets. Once I was sure it was working for me, I got a doser from brs and an apollo digital timer and dialed it in. I find it to be inexpensive and all you have to do is refill the dosing container, test weekly and adjust as necessary.