So I rarely check my tank's salinity just because when I did do it frequently, nothing ever changed. Over the years I've done less and less checking, and basically check it once a month before a water change. Long story short, I tested a few days ago and read 40ppt. I of course checked the calibration on my refractometer, and it was actually ready 2ppt low, so the actual salinity would be 42ppt! Oddest thing is I haven't noticed any issues with the fish or coral. I have a dusting of cyano on the sand, but otherwise, no visible issues. not sure how it got so high, must have made an error in a water change or something. Or all of the 2 part I dose is catching up to me.
How quickly should I lower it back down to 35ppt? I made sure to triple check the calibration on my refractometer, and checked with another refractometer as well. So far, I changed out about 12 gallons of water with RODI to bring it down to 40ppt. Does dropping it 1-2ppt/day make sense? Being that I don't see any issues with fish or coral, I'm not treating it as an emergency, but don't know how fast of a change is reasonable .
How quickly should I lower it back down to 35ppt? I made sure to triple check the calibration on my refractometer, and checked with another refractometer as well. So far, I changed out about 12 gallons of water with RODI to bring it down to 40ppt. Does dropping it 1-2ppt/day make sense? Being that I don't see any issues with fish or coral, I'm not treating it as an emergency, but don't know how fast of a change is reasonable .