Have been doing weekly water changes for 6 months with the tank looking great corals happy etc. Then noticed my red bubble tip anemones started uprooting and moving around with several splitting. So I checked salinity was "normal" 1.026 and was like hmm checked my calcium was 380 and my DKH was 7 yikes. So I bought a hydrometer and low and behold my salinity was 1.23! So I checked my calibration of my refractometer and it was off by the same amount.
Lesson of the story is calibrate your refractometer every time you do a water change to avoid this mistake. Thankfully nothing is dead but just unhappy. Will be doing a few water changes a few days apart to get the salinity back in check.
Lesson of the story is calibrate your refractometer every time you do a water change to avoid this mistake. Thankfully nothing is dead but just unhappy. Will be doing a few water changes a few days apart to get the salinity back in check.