I know from research I did before I got my star fish, that when you get them they have to be acclimated for quite a long time. They are pretty sensative. As well, they are not supposed to be taken out of the water during transfer. Not all stores that sell them know this, and they will just net them and bag them. Don't know how long you have had it for, or this is even relavent, but if it is a new purchase or somewhat new this may have something to do with it. I had an orange linkia(?spelling) star fish that did not do well. I acclimated it and transferred for the proper rec time. It was always trying to climb out of the tank. Sometimes I would find it at the top of the tank out of the water. Needless to say, it did not survive and fell all apart as well.