I am about 2 months in on a larger tank start. While I was checking ammonia, Nitrite and nitrate every other day, now, as I am getting ready to add in 2 part dosing, I am testing Cal, Mg and alkalinity along with pH, Nitrate and Phos every other day. I wan't to "unvote" salinity, because I do spot check it, but with my ATO, I don;t check it often unless I see an issue (like my ATO emptier than I expected the other day when a float stuck).