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wendyjo · 01-25-2013, 12:17 AM

Some sources of tap water contains nitrates, so test your water straight out the tap and see if that could be what's going on.

Is your tank stocked at all?

01-25-2013, 12:17 AM	#5
wendyjo Planted Tank Guru (View User Tanks) PTrader: (7/100%) Join Date: Feb 2009 Location: DC area Posts: 2,813	Some sources of tap water contains nitrates, so test your water straight out the tap and see if that could be what's going on. Is your tank stocked at all?