So yesterday after having zero nitrite in my tank this morning I get a reading of 0.50-0.75ppm for nitrite. What. The. Heck. Ammonia was 0.50 nitrate 10 I have NO idea what happened between yesterday and today. Only thing I did was reduce the amount of Prime from 4dpg to 3dpg and added the air stone from the old fish bowl I had previously. It did sit in the water for maybe a week before I cleaned out the bowl and cleaned the stone. The water was disgusting but I cleaned the stone then left it to air dry on a shelf for weeks until I decied to swap out the one in my tank for this one which I again scrubbed clean before I put it in the tank. Also we had a cold front yesterday and the temperature went down and their water went down to 70F could this be what caused the spike? I'm doing a large water change as I type this because I justifiably freaked out as nitrite has NEVER been this high ever and I tested the water twice. It figures I sort of expected something after nitrite vanished from my tank and ammonia had finally abated yesterday but WOW. The fish seem fine no change in their behavior but I'm wondering what caused such a huge spike from 0?