Most people don’t... Nitrate is tolerable to most fish, with some notable exceptions. If you want very little nitrate, keep a very lightly stocked tank, change 100% of the water twice weekly, use pothos filtrations and use an algae net nitrate filter. Keep a flat substrate you can vacuum and filter heavily. It can be done. It just requires this little thing called work.
Also note, commercial “nitrate” filters are typically wastes of money. Buyer beware.
Also note, commercial “nitrate” filters are typically wastes of money. Buyer beware.