I need to test for mag. what do you all use and i like to start with cost effective first, and if adjusting is needed what do i use for mag? also atm using Red Sea and API for alk, cal, phos and copper my biggest headache is converting color to charts and the drops some are read by ppm and CaCO3 and dkh very confuseing is there a company thats does all measuring the same way and are all thier test realiable with them but most important ATM is my MAG thanks in advance and happy new year


