Very beautiful Crocea clam!
Also,
The T. Crocea has the strongest Byssal gland of the Tridacna clams. They do best when placed in a hard surface, such as on the rockwork (which is where they are naturall found). If you wish to place the clam on the sandbed, you should place a large shell under the clam, and then place that under the sandbed so eventually, the clam could attach onto the shell. A PVC pipe may also work.
Here's mine:
Take Care,
Graham