Question about cycling rock

[Oilers]

I have a large piece of rock (about 5 lbs) that is covered by some ugly zoas and gsp. I am planning to take it out and let it go dry to get rid of the zoas and gsp. Once the rock has gone dry, would it be okay to put it back into the tank or do I need to cycle it? If it does need to be cycled, how long would that be?