have any more recent readings? Also you should be testing for calc and alk too. You use RO/DI water? if not i find it hard to belive that your nitrates are at 0. What test kits are you using? Tests like API are known to be not so accurate.yes the problems had been fixed... my last reading which was a week ago were
ammonia 0ppm
ph 7.8
nitrate 0ppm
nitire 0ppm