Hydrometers are handy, they are quick to use. I use one everyday, but I use my refractometer to check it every few months. Once the hydrometer has been calibrated with the refractometer it doesn't seem to wander off. I have one hydrometer that is dead on and one that is 0.007 off. That's huge.
Tony is right...don't change the salinity by too many points too quickly. I wouldn't go more than 0.002 per day, although going down in salinity isn't as harmful as going up in salinity.
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~ Mindy
SPS fanatic.
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