So I tested my nitrates with a Salifert test kit. I did two tests at the same time because I had weird readings last time. Both tests showed 10 ppm nitrates. I tested PO4, and color is somewhere between 1-3. Is it even possible to have relatively low nitrates and insanely high phosphates? Is something not adding up? I have some algae growth on my sand, I don't have a CUC yet, they are all in a Qt.