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Acropora / red bugs
Identification: One of the most recent "pests" who have now become prevalent is a very small crustacean that looks like a mite and appears to prefer most species of Acropora corals. This crustacean is yellow in color with a red dot, approximately 1/2 mm in length, and is very difficult to see without a magnifying glass. It has been theorized that red bugs are either a parasitic form of copepod or micro-amphipod, though very little research has been done and their true identification is not complete at this time, one way to control the pest's is with a DragonPipe fish also known as a Dragonface pipe fish
Here's another link ya'all might check out pure White Copepods & Micro-amphipods
are not harmful to your tank all species of fish,coral,anenomes love to eat them, they flow in the planktonic-drift and come out at night with the Moon cycle feeding your corals etc.
Micro-amphipods or one common name is Scud's are little shrimp that eat detritus and swim around in your filter/refugium system etc. If caught in the pump will be eaten shortly by your fish, anenomes, soft or leather coral. SnowWolf