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I started my tank a year ago with tap water. HUGE mistake! I tested the tap water in my area and its usually around 250-300 ppm. I have been using RO/DI water since the 6 month mark. I am still to this day over run with algae. I currently just filled my new 75g tank with fresh RO/DI water.... Hopefully no more algae over runnings with the new setup!
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