insta-ballooned

The size of my tank: 55 Gallon. Test Kit used API Master Freshwater Test Kit. Did one two hours ago Water parameters are as follows: PH: 7.6 High Range PH: 7.8 Ammonia: 0 ppm Nitrite: 0 ppm Nitrate: 10 ppm Tank is Freshwater. The Aquarium is new. I set it up about five days ago, I moved...