Someone just posted on the Fishless Cycling thread about buying ammonium chloride and whether they could use it to cycle their tank.I had never read anything about it or even heard it mentioned as a cycling alternative to "pure ammonia" or ammonium hydroxide. In doing a quick search, I found this article which I thought was quite interesting. Maybe this is actually a better way to go than bottled ammonia. Some experimentation would definitely be in order.