I am experienced in the aquarium hobby but am new to planted tanks. I have a Fluval Ebi 8 gallon shrimp tank that I have heavily planted. I occasionally dose Flourish, Iron, Phosphorus, Potassium, and Excel. I want to maintain decent plants without insane levels of growth. So far I have been successful. I also keep shrimp but I am worried about my Nitrate readings. I always seem to have high nitrates. I have less than 10 shrimp and I feed them only once every 2 or 3 days and very little at that since they eat the algae and plant matter in the tank as well. I have been doing water changes because my nitrates have been so high but my goal is to have the plants reduce nitrate levels. My nitrate readings range from 40 to 80 ppm!!! My tap water has less than 5 ppm. Could my fertilizers be affecting the test kit?