I disagree with the idea of dumping bacteria in and adding fish right away, if you can avoid it. These companies says you can, but your tank still cycles, so there are levels of ammonia and nitrite as ammonia from fish waste is added. If you can add ammonia after the BB, that is better. , IMO
. Your tank will cycle in Days, not weeks. If you add fish right away, they need to be hearty (clowns, damsels) so that they can take a few days of having ammonia and nitrites.
I just used Dr Tim's in my 240g, but got their ammonia to add. Tank cycled in less than a week.