The reasons I'm opting for the fishless cycle as mentioned above are:
1. Fishless cycling is faster
2. There is no need to kill, injure, sicken, or damage the gills of any fish
3. Leads to the growth of a much larger colony of good bacteria than would be grown by traditional cycling with fish.
I think this stuff should be ok, it only contains ammonia and water.
http://www.diggersaust.com.au/files/Aqueous%20Ammonia.pdf
Cloudy ammonia also contains a clouding agent.
http://www.diggersaust.com.au/files/Cloudy%20Ammonia.pdf