My current tank, along with some moves, has been up for 20+ years and I have never had any nitrates. Don't worry about this. If I can offer a suggestion, read up on nitrogen and how corals cannot use nitrate directly, have to convert it at quite some cost and use ammonia/ammonium to get nitrogen more efficiently. Also, how anoxic bacteria deep in sand and rock turn no3 into nitrogen gas which fully completes the nitrogen cycle. This can really get you ahead of the game in the hobby were most people do not know all of this.