I've had a pink milli colony that has done that on and off for the 8 months I've owned it. It has continued growing with no ill effects, so I don't even worry about it when it comes and goes. Does yours look like this?
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118g SPS/LPS semi-circle :
190 lbs LR,
30g ADHI Sump,
Mag 9.5 return,
Tunze 9010 skimmer,
Phosban Reactor,
4 Tunze Nanostreams Modded,
retros: 400w MH + 4x39w 36" T5
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