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Hi!
U can use a mix of purified water with Tap water, that's what I do and it works well.
Just have a little play with the mix until u get the right level u want
It's nitrates for sure , it's like 40-80 [hard to tell on API test kit] but I tested the water at work and it has hardly any, so I will probably just take a few jugs and fill them up next time I'm there.
If its well water then that explains the high trates. Any municipal water is regulated by the epa and has strict limits on nitrates. Anything over 10ppm is a direct violation. If your using city water then I suggest you be calling someone
We're on a well out in the county, and we have a special tap that we drink from. But it would be too expensive to fill my tanks using that water because the filters and lights for it are super expensive
A RO/DI filter will remove the nitrate, and everything else, from your well water. Of course you will need to use something like 'Replenish' or 'RO-Rite' before you use it in your tank. Will save a fortune in the long run over buying bottled water from the market.