Hanna Checker Ca: 547 Red Sea test kit Ca: 360. Hanna Checker Alk: 150 ppm/8.4 dkh once, 157 ppm/8.7 dkh. Salifer Alk: 6.5 twice. All test kits are new, Hanna Ca is brand new. Hanna Alk may need to be calibrated against a test sample? I am leaning towards, the values of 547 and 6.5, acropora are mad, they'll survive but I may pull out all my hair testing and getting wacko results ugggggggg. Followed directions to a tee and repeated test ugggggg. Run out of ways to double check my values. Help.