How much nori is too much?

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I've been feeding more like 1-2 inches square per day, not anywhere near a full sheet!! That is crazy, I had no idea they would eat that much!

So, mine is for a 6 inch naso tang, 4 inch yellow and 3 inch yellow tang. And of course the lawnmower. Now, they also get some flake, NLS pellets, mysis and they have all been doing fine for a couple of months. I guess I will try to feed them a little more nori then...

I problem I have, is the second the nori touches the water, there is a feeing frenzy and the floaters usually all get sucked through the sump so that is why I don't feed very much. Do your fish actually graze on the nori throughout the day or just devour it instantly??