Nitrate should be at max of 50ppm in freshwater, but some fish may be sensitive to nitrates and need much lower levels. The normal recommended level is 5-10ppm.
Denitrators are a pain to use, not to mention the suplhur smell that comes out of it. I recommend fast growing aquatic plants (Hygrophila polysmera, Egeria densa, Hornwort) even better bog plants (Spathiphyllum tasson is great for this). They do a much better, hassle-free job of eliminating nitrates. |