I would run the lights, although others might say no. The reason I would do it is because some of the stuff on your rock needs light to survive, and you want as much stuff to survive as is possible. A drawback, though, is that during your cylce you'll be producing all sorts of dissolved nutrients, and light during this time could spark a nasty algae bloom. My suggestion is to change water frequently during the cycle, again with the idea of minimizing the ammonia spike and preserving as much life on the rock as you can. If you have a skimmer, I'd get it going as well. The less ammonia you let build up in your system, the less die off you'll have and the less build up of nitrate after the cycle.