I've been having issues with my tank lately...I've been wondering where all this algae and cyno had come from, and ALL my inverts have died, so after doing my initial tests, my salinity was at 1.030! I been using a new bucket of reef crystals, with the same measurements as the last bucket(3 cups of salt per 5gal water of ro). My corals have been shriveled up and a few of my sps corals are bleaching. I've been doing water changes every 2-3 days to remove whatever nitrates and phosphates from all of the die off and to lower the salinity. I've finally gotten it down to 1.026/35 ppt. If it ain't one thing, it's another in this hobby.