On my new 150 i am going to be adding only SPS corals and Clams i was just wondering how inportant is it to feed the clams. Im useing 250w 10K an 20k XM bulbs and also with the help of a Dual Chambered Calcium Reactor. The tank depth is 16 inches. Also there might not be any fish going in this tank at all strikly SPS & Clams. What i really want to know is do you really have to feed clams to live.