Hi all. I am fishless cycling a 200L tank with ammonia using the "add and wait" method. My Nitrite readings are still off the chart, and today for the first time, I got a Nitrate reading, also off the chart - deep red (API kit). I also decided to check my PH and it has dropped significantly: it's been sitting at about 7.4, and today the reading is at about 6.4~6.6??? Can this be right? Obviously this change coincided with the nitrate appearing today, so I was wondering if this had something to do with it? In theory, this PH level is fine with me because I was wanting to keep acidic water fish, but I was wondering if such a massive fluctuation is normal?