Products like Cycle are IME
a waste of the bottle they where packaged in.
As far as not getting an ammonia or nitrite reading, it could be the rock you purchased was that well cured of the smaller amount may not have been sufficient to get the cycle started. Do you/did you ever get a nitrate
reading? If that is present still, the cycle may have happend and you just missed it.
Could be the test kits as well.
If you have never had a reading on any of the nitrogens, I would personally play safe and toss in a raw cocktail shrimp (or 2 considering the tank size) and run through the process to be absolutely sure you have a strong biological filter in place before adding animals.
What type of tank will this be FOWLR