Not sure if many of you knew this, but there are 2 kinds of red bugs.

One of them is the dreaded parasite of our beloved acros which no sps keeper wants. The other is a harmless scavenger, and a great source of food for mandarins
I stumbled across this info by accident after nearly having a heart attack. I was downstairs checking out my tank, enjoying all of the growth i have been seeing, and noticed some little red spots on the front of my glass in the sand. Upon closer inspection, my sand had literally thousands of these littl red bugs. My first though was F@#K ME, I AM SO SCREWED. Started doing tons of research and came across an article on the other forum explaining the differences between the two.
The parasitic red bugs will only be found on acropora (i have none on mine) they will not live in the sand like the benifical kind. Hopefully this helps people.