clams wont stay up!

[EyeCandy]

I cant get my clams to stay, they always fall over and i have tried them on the rocks and one of them HATES it on there and pushes itself off and the other seems too big to be on them so i have them on the sand. I feel like i have tried everything to get them to stay but they always fall over, any suggestions? I believe they are squemosa and demesa, cant spell lol.

 

[derrikd]

they are doing that BC the do not like where they are. what lighting do you have?