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The lack of ammonia and nitrite indicates a good beneficial bacteria bed.
Do 15-20% water changes twice a week or 25% once per week for a few weeks to reduce your nitrate. Take care not to over-clean the filter or substrate so you can keep your good bacteria alive and healthy.
If your tap water has a high pH this will help fix that too.
Usually high nitrate causes the pH to drop.
Also, if the substrate you are using is not crushed coral or coral sand, I would add some or gradually switch to it. Remember to do this over the course of a few months so your bacteria can transfer to the new substrate if you do replace it. Coral based substrates help keep the pH in check.
Good luck.
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