We ordered a 28 gal nano tank and are wondering what kind, amount of live rock we should use. We were looking online at gulfliverock.com for some rock. We were thinking of 20lbs of coraline rock and 17 pounds of premium decorative rock. We were going to just put in tank as it will be only thing in it to cycle. Is this a good idea? Anything you would recommend that would work better? LFS has only has mostly white rocks they submerge in a tank once they come in.