I have a fish-only tank currently and I purchased a Neptune Trident. I thought it was malfunctioning until I confirmed the measurements with a 3rd party test kit. I use Aquaforest Reef Mix salt with RO/DI water. I also used the Aquaforest synthetic rock. The Aquaforest salt is supposed to mix to 7.7-8.3 Alk, 440-460 Cal, 1360-1420 Mag. The Neptune was providing an Alk out of range error. When I tested with my Hannah kit it read 15.7 dKH. The Calcium is around 100 ppm (maybe lower). Has anyone experienced anything like this with synthetic reef rock?