I’ve had this tank running for about a week and a half now and my nitrate results varied. I tested my tank 3 separate times (as well as the tap water) and the nitrate has been going between 0 ppm - 20 ppm. The filter is brand new, and from my understanding there shouldn’t be any traces of nitrate at this point. My only guess right now could be a faulty test kit but I’m still not sure. Does anyone know what this could be?