i would have to disagree. sand loving clams need a sandy bottom so it can attach. The bigger clam you get the less sucessful you are going to be. Most sand loving clams loose their bissle orang which then they depend on their weight to keep them stationary. if you have it on rock work and the loose their bissel organ than you have a 40+ dollar clam falling and potential damaging itself.Also PC just don't have enough lumens to penetrate all the way to the bottom. I would trade in the tang an put it towards lighting. you cant beat HO t5. you get the most penetration of light. check out
http://www.reefbuilders.com/forums/e...-light-do.html. You get almost twice as much penetration on the bottom of the tank with T5, and you get a cheaper electric bill.