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There were 55 x 0.20 = <<55*0.20=11>>11 red candies.
There were 55 x 0.30 = <<55*0.30=16.5>>16.5 orange candies (which we'll round up to 17).
There were 55 x 0.30 = <<55*0.30=16.5>>16.5 green candies (which we'll round down to 16).
There were 55 x 0.20 = <<55*0.20=11>>11 blue candies.
So, there were 11 x 0.20 = <<11*0.20=2.2>>2.2 blue candies that had a damaged candy coating.
Since we can't have a fraction of a candy, we'll round 2.2 up to 3.
Therefore, approximately 3 blue candies had a damaged candy coating. Answer: \boxed{3}.