Tom Barr05-01-2009, 05:11 PMI hate FC, the whole thing seems like some marketing scam to sell products that do not work as well as the free items.
I use mulm, the dirty sponge squeezings, or the vacuumed dirt from a mature filter/gravel bed, also, plant roots are covered in bacteria, these are live actively growing bacteria that immediately cycle the tank.
I have no cycle in any of my tanks.
I suppose if you live in the Yukon and everything is mail order (including the fish), and you have no plants , fish only, then bacteria in a bottle or NH3 might be okay, but then do it in a bucket with the filter only.
Then add that to the main tank later.
With plants, there's no reason to FC.
Adding mulm adds precisely what is missing from a mature established tank. No bottle or NH3 dosing is going to beat that, it's instant and it is what LFS's have done to seed new tanks fast/instantly. Planted tank are not very reliant on filters, they remove the NH4 directly through plant uptake, so there is no cycle.
Water changes and Zeolite can also mitigate any issues with cycling also.
I've never done a fish less cycle.
Never had a need. Long long before there was a web or the issue was suggested...........
Regards,
tom barr