Why is my water so hard? I measured it this morning and it showed between 150 and 300. What can I do, is this a problem? What should the numbers be? I have a 90 gallon tank with a Marineland 530, and HOB, a UV running, another home made bio filter. NO3 at 40, No2 zero, the ph is about 6.2, but the hardness is high. Do I need to do something?
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