My clam wants to lay low

My clam doesn't want to stay up right. I've done what i was told to put a flat rock underneath. And it stays for a while but return on its side. Then i put rock besides it it still manage to go on its side.



I thought the lights might be to strong, she's on the bottom. Its a Tridacna crocea , The sand is 2" deep, but the rock i just put a week ago didn't help either.



Any ideas?? She seems fine 3" wide i feed Utlraclam, Ultramin S, UltraOrganic, UltraminS Ultraseafan thats all for my sponges and gorgonias so she's getting her fair share plus phytoplankton every 2 days.