How much yeast nutrient to use in a 5 gallon imperial batch?

[flinnusa]

Making a 5 gallon 2 mash, 10 percent Imperial. With 3 Wyeast 1084 Irish Ale Yeast packets. how much yeast nutrient should be used?

http://hopville.com/recipe/194773/russian-imperial-stout-recipes/coffee-cake-imperial-stout

 

[TipsyDragon]

i dont think you really need the nutrient if your making a beer. but if you want to add some it won't hurt. just read the package it will tell you.