I'll throw in my two cents again. Now, this is based on experience. I tried a method similar to what Xielos is trying. Only, I started off with gravel and filter squeezings from an established tank. The ammonia level was brought up to 5ppm. After about 2 weeks, it dropped down to 3 ppm. At that point I figured, hey, the cycle has somewhat started. Let me go and add bio-spira. So, I added 3/4 of one of the big pouches (I think for a 90 something gallon tank). I have a 55g tank, so I figured I was good. I waited a few days and checked for nitrites. Once I had those, I added the rest of the package so I could be sure that I was introducing a large nitrite-eater colony at a time when there was food available for them. Okay, should be good right? NO. The tank levels stayed at 3ppm ammonia, pH 8.5, .3ppm nitrites, and 20ppm nitrates for another 2 weeks.
It was at that point that I figured something was wrong. So, I e-mailed the manufacturers of bio-spira and explained what I did up to that point. They said that in order for it to work properly, you need to add it to the water and then add your fish. To me it defies logic. Fish=ammonia and I added ammonia so it should have worked. But, in reality, the cycle stalled. I think it had something to do with the pH of 8.5 due to the large levels of ammonia. That's just a hunch. But, anyway, I don't think fishless cycling with bio-spira is a reliable method, not at levels of 5ppm ammonia. Maybe you could try a much smaller concentration......say 1ppm........and build it up from there. That might work. I just feel that intoducing a large amount of a base into the system is bad mojo for bio-spira.
That's my two cents.............again.
Oh, and one final edit. After realizing that the whole cycle had stopped, I changed out 90% of the water, added 6 cories and 6 zebra danios, an amazon sword, a red crypt and 2 other plants that I can't identify. I watched the water levels religiously and did small changeouts every day until I consistantly got 0 ammonia, 0 nitrites and only a little bit of nitrates (10-20ppm). I didn't lose a fish and everyone is very healthy and active today, even the 5 otos that I added 3 weeks ago.
I understand the risks of fishy cycling but, is it really that awful? All you have to do is watch your levels and change water accordingly and the fish will be quite happy. Throw in some plants to help eat ammonia and nitrates and all will be okay.