I used biospira when setting up my 50g tank. Followed instructions, added all the fish (several kinds of plecos, rasboras, and a female betta). Three days later I tested the water and ammonia was at 2ppm! I quickly began water changes as necessary, and the cycle was absolutely complete in a week and a half, instead of 6 weeks. It works, but it's not a miracle product. I am glad to see you are doing your research before, instead of after (like I did).