I have a 180 with a 40 gallon sump using dry rock and dry sand. I used ro/di water to make the salt water. I let the tank run for a few days for the temperature to balance. I had adjusted ph and alkalinity according. I made sure all filtration was off and then I added 16 oz of One and only. I let that settle for a few minutes and then added the recommended dosage of ammonia chloride sold on the site. It has been about a week and my ammonia has been 0 for 2 days now, but my nitrites are at 5 ppm. Using the API saltwater test kit. I was under the impression for fishless cycling that the ammonia and nitrite would be zero after a week when using one and only. Did I get a bad batch? Please let me know. I have cycled other past tanks before with biospira, raw shrimp and live rock, but have never seen these kind of readings before. I have made sure the pH had not fall below 7 by measuring pH everyday. This is what I have followed to a "T", but haven't made it past the first dose. A Quick Guide to Fishless CyclingThere are many opinions about how to fishless cycle your aquarium. But they normally just confuse readers and generate more questions than answers. Below is an article explaining the process and a couple of ways to fishless cycle, which we encourage everyone to read. But here we present a short, concise recipe on how to fishless cycle your aquarium. You can choose to add DrTim's One & Only Live Nitrifying Bacteria or not with this method. But, of course, by adding our bacteria, the cycling time will be shorter and you'll be watching fish in your aquarium sooner.MATERIALS NEEDED: You will need an ammonia solution, ammonia and nitrite test kits (a pH test kit is also a good idea) and a little patience.The Process: Day 1 - dose ammonia to 3 ppm. Days 5, 8, 11, 14 (every 3 days) - measure ammonia and nitrite. When ammonia and nitrite are both 0 ppm, add more ammonia to 3 ppm. Now measure ammonia and nitrite every 2 days. When ammonia and nitrite are both 0 ppm, add more ammonia to 3 ppm. Now measure ammonia and nitrite every day - when ammonia and nitrite are both 0 ppm, add more ammonia to 3 ppm. Continue to measure every day - when the water is able to process ammonia and nitrite to 0 ppm within 24 hours, you're done! Do a partial water change and add some fish.