Will the algea grow on live rock in a cycling tank? I am doing the same thing as the original poster is doing.....adding live rock slowly. I have about 7 pounds in there right now and I was told by a local fish store to add a few shell fish to help with the cycling. I added a green emerald crab today. The reason I ask is because he will need to to eat the algea off of the rock and if it stops growing (lots of it on there now) he will run out of food. I keep the light on for several hours a day, so that should help the growth. I really need him to eat alot and molt because he is missing two claws and a leg (but I still saw him eating).