I used Microbe-Lift "Special Blend" to help cycle my tank and to maintain it for a couple months afterwords. I've had problems with ich disease, pH levels, overstocking and tannic acid, but my ammonia and nitrite/nitrate levels have always been 0,0,10-20. It took 3 weeks for me to cycle a 29gallon tank and didn't add Microbe-Lift until the 2nd week. After that I think the already established bacteria started to flourish and my tank finished cycling soon after. Here's a link: http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+20024+8161&pcatid=8161 I was able to find it at one of my LFS. Almost forgot, I try to use as few chemicals as possible and this product is supposedly chemical free.