The Striped Green mushroom is hardy and relatively easy to maintain. They are semi-aggressive and require adequate space between themselves and other corals and sessile invertebrates. Multiple Quantities will come as one piece. They will come as one 1 Green Mushroom attached to small piece of rock or rubble. Please note, that when mushroom corals are shipped, it is perfectly normal for them to be deflated and very small upon arrival. Once adjusted to your aquarium conditions, however, they will fully open. The acclimation process normally takes several days to a week. Approximate Purchase Size: 3/4" to 1"