Currently have a 80 gallon w/ 26 gallon sump - stocking with Tomini Tang, Neon Dottyback, 2 clowns and a foxface. Various CUC (conchs, urchin)...tanks been up and running for 3 months.....why can't I get nitrates? lol. I have a skimmer (it's been off for a week) and a scrubber (it's also been turned off for a week+) and my nitrates are low. I'm dosing to get to 5, but I'm just befuddled why I can't keep nitrates up? Anybody got any advice on how to build up nitrates? I've been feeding like crazy and my phos is high now that my skimmer/scrubber is off but my nitrates dropped off the map. I was usually around 10 but about 2 weeks ago it just disappeared. I assumed it was the scrubber doing too good a job, but with the equipment off I'm just confused how it's so low.