My
nitrates are at 80
ppm, and that's the lowest they've gotten since I inherited the tank.
(When I inherited the tank, ammonia, nitrites, and nitrates were high, and the nitrates were an unknown amount over 160 ppm - that was the deepest color on the card, and it took at least 2 months of many water changes and substrate vacuumings to finally even get it to read a different value on the card. Also, DO was probably a problem, and I've since added a protein skimmer and 4 powerheads on a wavemaker.)
I'm using the API Saltwater Master Test Kit.
