no nitrates

My Fluval 13.5 is running consistently at the following numbers now for two weeks. Is this a problem, and do I have an in incoming Dyno issue? I have 3 fish, and a mixed softy/LPS reef set up (no SPS). no Ammonia/Nitrites (check once per week) Salinity 1.025-1.026 (refractometer) PH 8.4 -...