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I'm also using a hydrometer, but is watering ever 2-3 days about right?

This is my first grow, I have the Marijuana Growers Handbook by Ed Rosenthal but I can't seem to find the part I'm looking for even through I've read it twice. Anyway, how often should I use the nutes? I vaguely remember it being every other or every three feedings but I want to be sure before I...