I used your One and Only for a fishless cycle. I started at 2 ppm as the bottle instructed I poured in the product last Tuesday and the number readouts are, as of today, at: Ammonia: 0.50 ppm Nitrites: 5.00 ppm (A little Hard to tell. Using API kit but its definitely between 2-5) Nitrates: 40 ppm Ammonia has not dropped in the last 4 days but nitrites have skyrocketed and so has nitrates. Should I go ahead and do a water change as the nitrites are becoming fairly high? If so, how big of water change? I was thinking at least 50%. After the change, if recommended, how should I proceed from there? Thanks!