They can measure different levels bc source can be different. Phosphate can come from using unfiltered tap water, KH buffers, activated carbon and some say from flake foods. Are you using RODI water?Ok...But what really messed my mind was the nitrates high and phosphate low. I thought they were supposed to be more like the same.
Enviado do meu iPhone usando o Tapatalk
Whereas Nitrate is byproduct of fish waste and uneaten excess food, its the final byproduct of the nitrogen cycle...so basically Nitrate is mostly from organic waste. If u overfeed and too often, u can/will have high nitrate. How often do u feed and are the fish eating everything in few mins?