I would define "too much" as the point when your tank starts having problems from overfeeding. Problem is, as far as the fish is concerned, you can't overfeed them, they're always hungry. And in the ocean where the food supply is more or less infinite (maybe in smaller doses, but basically they eat all day), tangs are 4 to 5 times as fat as the fattest fish you ever saw in an aquarium.
So the trick is finding the balance of not trying to restrict the feeding too much, without cratering your system in the process.
Depending on the tank size and bioload buffering ability of your system, I'd consider two 2x2 pieces, if I could swing it. (I personally can't do that in my own system, I feed about a 2.5x4 sheet once per day, and occasionally twice as a treat). Like I said, you have to find the balance. Keeping the fish too hungry is cruel, but so is keeping the fish in a nitrate soup (my $.02 anyhow).
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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