I bought a Red Sea test kit for PH, Ammonia, Nitrite, Nitrate, Akalinity. Well just to get a second opinion, I still had some Nitrate tests from my old test kit, an Aquarium Pharmaceuticals Saltwater Master Test. Red Sea reads higher than the API test kit. Anyone have an opinon on which kits are best? Not just out of those two, but out of all the kits out there. Thanks!!