Give it a bit more time, unless this was pre cured rock, its likely just the first wave, all the bacteria that turned your No2 to NO3 will die off as you now have 0 No2. Its probably already started to happen, giving you the .25 ammonia reading. Keep testing and you should begin to see lower and lower spikes until things stabilize. On the other hand if the rock has already been cured, you may be lucky, keep testing and you will see when it stabilizes.
Once the cycle is over, do a large water change to knock the No3 down. That is unless you plan on doing w/c during the cycle.
|