API master kit (liquid).
Hmmm yeah, looking back on the tap water I tested, the ammonia level out of the tap is between .25 and .5 ppm. Nothing is listed for ammonia in the water quality report. Though I do have nitrates in the water, but none in the tank.
A puff of grayish dust came out when I turned on the sponge filter in the cycling tank (was in my more established 20g tank).