Not a happy looking scallop :nope:
Most of these animals - there are exceptions - but most will die within a year.
Great article online by Rob Toonen. Look up his name and "flame scallop" in a search engine and you will probably find it.
Where ever it decides to go, BTW, you should leave it. DO NOT try and move it...they know where they want to be, even if it is behind your rocks.