[Myka]

So yesterday I decided to check the calibration on my hydrometer which I do every few months. I have a few hydrometers, but the one I use daily is the Deep Six. I have had it for 2 years, and remarkably it has actually been accurate from day one. So I test my tank with the hydrometer - 1.026, then I test with my refractometer - 1.030! Then I carefully recheck using the same sample for each check. Yep, that hydrometer is now reading 0.004 lower than actual. Yikes! So starting yesterday I slowly lowered my salinity down to 1.026 which also dropped my calcium, alkalinity, and magnesium which I slowly bumped up. I think I used up half my test kits today. Ugh.

So let it come to awareness yet again! Don't trust those dang hydrometers - recalibrate often!