Hi, i have been trying to reduce my NO3 levels for a long time now... have been doing regular water changes (weekly) for over 6 months but at the last day end up having 10 mg . I have went through few forums and website which show addition of vodka could help me reduce the NO3 and PO4 levels. I wanted to know how safe it could be and if somebody who is already using it could give his view about it??