I recently made a large batch of SW, 20 gallons, and took all of my rock out and put it into the tub. In the tub, you can rearrange and then rearrange your rock work again, without the threat of breaking your tank glass (i tend to drop the heavier rocks by accident). I tried my best to re-work the rock to see if I liked the new aquascaping- It kind of gives you room to experiment- just make sure that when you do rearrange your rock, that it's not out of the water for too long... It can potentially lead to die-off and cause a nitrate spike.