I have a 75 g reef tank. I started it in early November. I thought that it had cycled in about a week but I was wrong. When I thought it had cycled I put in a yellow tang after about 12 days of it being established. 1 week later I got an arrow crab and a flame scallop. On December 1st was when I realized that it was just then cycling because in the matter of a week, ammonia went from 0-8.0. Luckily nothing died and a week later I got my ammonia back to normal. My pH, ammonia, and nitrites are good. My nitrates are still high which I expected, they are ranging from 40-80 ppm
. Do I just leave it and hope that the cycle lowers it? And when is it safe to add another fish? How long should it take for the nitrates to lower?