On another thread I posted that my Nitrates went to 160ppm. Yesterday I added a carbon reactor and swapped out the GFO in the other. Today my Nitrates are 80ppm. I bought a garbage can and faucet adapter for the RO/DI unit and am mixing up SW. I plan to do a 25g water change as soon as its ready. Then I think I will start vodka dosing; I will open another thread if I do.