Im going this weekend to buy supplies to set up my 29g tank....and was wondering how much live rock and base rock I should get? I was going to get a total of 30 pounds? Is that enough or too much? And is it ok to get like 10 pounds of live and 20 pounds base? Also I was going to get a 20 pound bag of sand or crushed coral and then just get a pound or two of live sand to sprinkle on top?