Are you fishless cycling? If so, dose the tank with 4ppm of ammonia and wait twenty-four hours. If the tank converts that ammonia completely to nitrates in that time period, your tank is finished cycling. Do a large PWC and go get some fish!
In that case, you could do a PWC to reduce the nitrate level, measure ammonia, nitrite, nitrate immediately afterwards, then measure again in a few days. You should see zero ammonia, zero nitrite, and an increase in nitrate.
It is unlikely plants could consume 5ppm in a day though... are you shaking bottle #2 for 30 seconds like in the directions? I guess you haven't done a water change yet so I am intrigued by that nitrate reading.
However if your tank stocked with the gourami is reading 0 ammonia, 0 nitrites for a week I'd say you are cycled I would then wait two weeks to add more fish.
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i have yet to a water change since start the aquarium. i used safe start so i just monitored all the readings and they never got out of hand so i just let it run it's course. yes i have done the nitrate test many times i sigh every time i have too haha. the nitrates colors are kinda close but i can easly tell the 5 ppm from the 10 ppm but the 10 and 20 looks almost identical impossible for me to tell from the test tube.