FINALLY! Yesterday and the day before, my nitrites had gone down to .25ppm (from .50ppm), and like magic this morning, they were at ZERO! Nitrates are still 5ppm, ammonia 0ppm. I'm so excited and actually quite amazed that it finally worked. Thanks to everyone who helped me through this learning process. I could not have done it without you! So, now what do I do? Start weekly water changes a week from today kinda thing? HOw often do I perform water tests? And when I change water, is it ok for me to return to thorough gravel vacuuming?