I inherited a tank on Friday. New substrate and new filter media so having to cycle from start. Using Stability and Prime. Today (day 3) my Nitrate levels using API master kit are very high for sure 40, but looks more like 80 on the card (hard to distinguish). Nitrites are zero and ammonia is one. I have a fluval test kit and it shows nitrate 20, nitrite .8 and ammonia 2. What's going on. Is API affected by stability and prime? I don't know which test to trust. Fish seem ok.