You should not do fishless cycling.
It really is that simple.
Add plants, they use NH4, they have lots of bacteria on them, you add them and fish the same day. You xcan also use mulm, this cycles a tank instantly, any tank for that matter, why wait 3 weeks when you can start the tank now?
The bacterial levels equilibrate nicely.
Add lots of plants from day one, unless you enjoy bacterial cycling, like to wait 3 weeks, enjoy testing the NH4, NO2 levels.................
Someone did not think too much when they suggested this, it's okay for fish only tanks, but adding mulm from an established tank, (mulm=>filter squeezings, vaccuumed dirt from a tank that's 6-12 months old or older) will immediately cycle any tank.
Long long before FC ever was around, much less the web and myths it supports, we used mulm and dirty sand from one tank to cycle a new tank.
LFS's did this and suggested it to their customers also.
Gee, somehow we managed to eek by
Still works as good as ever.
Why wait 3 weeks when you can live living bacteria from an established tank?
Adding mulm adds precisely what is missing from a new tank.
Some folks actually are quite practical in this hobby.
The only case where you may want to do this: no mulm is available, it's your only tank(a new one), you have no friends near by that can send you some, there are LFS's near etc.
and you had to buy that new tank somewhere...........
Tom Barr www.BarrReport.com