Hello I was just wanting to know if anyone has used that Nutrafin Cycle to help cyle your tank? If so I was wondering how fast does it take to cycle your tank with using it? I know on the bottle it says "Allows immediate intorduction of fish" but is that really true? I mean does it mean after using it for 3 day or what? I have already had 6 zebra danio's in the tank for 15 days now and I heard that this stuff could help out with the cycle process so I just wanted some advice from anyone that has had any experience with it. Thanks!