Hi everyone, I have both of the testing products in the title. The liquid test kit reads my two planted tanks at 0 ppm ammonia & nitrite, but 20 ppm nitrate. My API test strips read 0 ppm on all three. I bought JNW brand test strips(I didn't want to order just one thing of Co-op test strips), and they also read 0 ppm for all three nitrogen compounds. What should I believe? My fish don't act ill from nitrate poisoning. These are my tanks by the way. A 75 gallon paludarium with around 30 gallons of water, and a 29 gallon aquarium.