I can't find bio-spira locally - even tried both locally owned LFS's.
Some ppl swear by this; I do not believe that there is any 'true' benefit, eitehr way it won't do any harm. I know ppl will chim in on this one, but oh well :dive:
Anyways, great decision on the fishLESS-cycle !!!:dance2:
Test daily for ammonia/nitrItes and simply ensure that your ammonia stays up (3-5 ppm is ideal).
Shortly, when your nitrItes ketch up your ammonia will drop in a single day. Just keep up with the ammonia levels and let us know to feed the nitrIte bacteria. The flakes are good, but I used pure (no sufficants/purfumes) ammonia to keep up with my hungry nitrItes - I know both work fine.
Keep temp up and the lights off/low will help too (No water changes until done)!

There is a great writeup on this in the Articles Section of this forum too!
Oh, and Gratz on the 55G tank...this is how it starts :grin: MTS!
