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I dont think it should be constantly hanging there. The tang will pick the live rock too. I would say feed on the clip 2-3 times per week. My tang and blenny eat it in less than 10minutes.
I have 3 tangs and a lawnmower blenny so I tend to have a piece in every day. But I also don't have alot of algae in the tank on the rocks so I figure better they have too much than not enough.
since you feed only flakes i would keep nori available. i would try a varied diet. perhaps some other rinsed frozen food once or twice a week as well, or maybe something from the seafood section at the supermarket.