It really depends on what kind of high you want. The more amber thrichs you have, the more of a couch lock high you will get. The less amber and more cloudy trichs will give you more of an energetic high. So it really depends on what you prefer. As far as putting them in the dark before harvest, 2 days is what I find is best. You can try 3 if you want I hear that sometimes it helps produce more resin, but I see no difference when I do it. Search around on the forums here you will find so much information bro.