RO/DI is the way to go, you aren't gonna see much improvement otherwise...
Consider it this way... if you start doing your 20% water changes with zero nitrate water, and are adding zero nitrates through feeding or fish waste... Week One you will be at 64ppm, Week two will give 51, Week three will give 41... and so on at 20% decrease per week, it will still take a LONG time to get your nitrates into aceptable levels of 10 or below
If you are using 20ppm water, you are almost running on a treadmill... because you are putting back in a substantial portion of what you take out


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