While salinities vary in the ocean from place to place the average is 35 ppt.(1.026) 1.022 is indeed low. 1.023 would be the minimum range for a Reef tank.Keeping it at the low range(1.023) leaves little room for errors in testing and implementation. Any stony coral will benefit from a higher salinity and Brain corals are especially sensitive to low levels of the big3.It is much easier to keep proper levels in solution at a higher salinity. Here's a good read for you April and Vareef. http://reefkeeping.com/issues/2007-03/rhf/ I would slowly raise the salinity to 1.025 using a calibrated device. I would also test Alk.,Calcium, and Magnesium.