Really depends on what lights you have. I don't think you could get away with never feeding it, but they should do fine with direct feedings every month or so -- assuming you have the proper lights. However, with that said, I have noticed that mine do look better when I do/did feed/fed them every week or so -- usually a piece or two of frozen (( thawed )) krill.
My current green one hasn't been directly fed in a couple of months, and seems to be doing okay. However, now that I am settled from a recent move I am going to start feeding it again -- looking a little "worn" out after the move and what not.