It depends on your light to me just telling us its 14000k doesnt tell much. I have mine under a ATI Hybrid Powermodule which is at 50% after 3 months of me raising it up slowly because above 70 it almost instantly bleaches everything. All 3 of mine are on the sand 2 Ultra Maximas and 1 Teardrop. For my very small clams i put them on small pieces of shelf rock i have laying around. Also what are your parameters. Clams need a very stable tank with not much changing, and high calcium. Mine is at 450. I find the two most important params to be Alk and Calc so be sure to check those. Also make sure nothing is picking at them even if there picking at the mantle it may bother them.
Another thing I've learned recently is people clams Hinges are coming apart check that as well people have used simple solutions like velcro for that.
It would also help to know how it was when you first got them.
Hope this helps.
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