Fishless Cycle Help

Another water change is definitely needed right before your next dose of ammonia. Your nitrate is increasing at such fast rate, and the PH drops so quickly.

I suggest you do another test on at least the ammonia before the next dose. In case if you still have a lot of ammonia in the water, you don't want to overdose it.

If you can further increase your water temperature to middle to high 80F, and add an air stone or two, you can future speed up your fishless cycle.

Keep up the good work.