The air stone will do since the LR
needs oxygen. I just prefer the water movement from a powerhead which also provides oxygen. Same principal applies with an established SW
tank. No oxygen, and everything dies. LR
bacteria, hence the rock dies, the fish, coral.
The powerhead works IMO
to kinda blow off and clean the rock, so that when it is finally cured, the decayed dead stuff would have likely fallen off. With the powerhead, I'm thinking you can give it a good nylon brushing and SW
rinse to get the dead stuff off.
Also, don't need the light on the rock either. Just watch until the ammonia and nitrite go up and down to know when it's ready. Then you can add it to the main. If you don't add it to the main after its cured, you'll have to feed the bacteria an ammonia source with small amounts of fish food. So it's better to watch the readings and transfer when ready IMO