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If your hardness is 0, be sure to do regular water changes to avoid swings in water quality , don't just top off. In low ph , low kh (carbonate hardness) systems ammonia can be a problem as it converts from a relativly harmless form at low ph to a more toxic form when harder water is added from your tap. Hard water keeps ph high and stable, but as water sits in your tank and is used by fish, plants, and bacteria ph drops, changing ammonia to ammonium. Then when you add water, raising the ph, it converts back to ammonia and kills fish. Regular water changes will keep your tank stable .
Good luck!
P.S. vinegar will disolve the scale deposits around your filter, just be very careful not to get it in your water, obviously
Good luck!
P.S. vinegar will disolve the scale deposits around your filter, just be very careful not to get it in your water, obviously
