I currently have a 30G FOWLR tank which has been up for almost 2 years now and I have stumbled upon a FREE tank between the sizes of 80-150G tank (the person I am getting the tank from doesn't know the exact size). If I remember correctly, I have about 60lbs of LR in my current tank. I also have a substrate of CC which I am planning on switching to some kind of sand substrate. My question is, how much more LR should I get and how many lbs of sand would I need to cover the bottom of a 100G tank? I am eventually planning on turning it into a full blown reef once i save the money to do so. I currently have a damsel, 2 clowns, an orange firefish, a neon goby, a cleaner shrimp, and various other snails and hermit crabs.