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Invest in a glass floating hydrometer. These seem to be the most accurate. Refractometers need to be calibrated regularly, so when you buy one get...
I have what I think is this in my tank. We looked at it under a microscope and were unable to identify it. Our guess was a sponge of some type. It is...
If it is chrysophytes then it is silica based. Running gfo to lower silicas, andchange out your DI resin because silica are the first to be released...
Alk and Ca is all you really need to test. I test alk twice a week and ca once a month. Mag should be maintained by water changes
If you disturb the sand you are asking for trouble, better to throw it away and start with new.
Was your first test 0.26 or .026? My hanna checker doesn't read a third decimal point.
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