Hi Quant, I'm not an expert on this subject by any stretch of the imagination but I've always read that these negative entities only inhabited the 'lower' realms of the astral, though I could be wrong. I've also read that as a person 'raises' their vibrations these entities cease to be a problem, since they are primarily on a low vibratory level.
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A man's reach should exceed his grasp, or else what's Heaven for?
-Robert Browning
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I am still reading Robert's Astral Dynamics book, and am just getting curious about questions i've had in the past.
I was read a website about Shades (Entities that try to upset you so they can feed off your negative energy) a while ago. Do they exist in the Real Time or is it the higher realms?