I disagree with Dav above: anything with a mouth should be fed.
Can these corals survive with just lighting and water changes? Depends on your definition of survive. They will get some nourishment through the photosynthesis their zooxanthellae are performing, but in the wild they'd also be picking up tiny foods from the water column. Why starve them when feeding is so easy? And even corals without an obvious mouth have been shown to have whole foods in their digestive tracts (interesting work going on with Xenia regarding this).
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