i bought mine through here and loved it. i received a couple big pieces, like 10-12 inches by 5-6, and some in betweens... the smallest piece i got was probably 6x4x2 at the longest measurments. the package also came with a few hitchhickers, 2 emerald crabs, a few snails, few shells. even some polyps. so... yeah, get some, i'm personally waiting till my s/o gives me the go ahead to get some more.