Need help to remove nitrate 8 ppm

The simplest way is by water changes.
The best way is by carbon dosing but that is a whole other animal...
Tell us about your setup and maybe we can make a better suggestion for you.
 
Incomplete nitrogen cycle
Feed less
Refugium
Algae turf scrubber
NoPox
Carbon dosing...

There are many ways, what exactly are you trying to accomplish? With no details other than what you posted, it's tough to offer any assistance.
 
8 ppm is fine and I wouldn’t do anything different unless it is rising fast. Driving it too low is worse that letting it rise a bit.
 
Do you see anything wrong with the tank that would make you want to lower it more. At 8ppm you shouldn't see any issues
 

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