Looks like it may be chrysophytes..a silicate based algae. Try searching Google images and see what you think. If that is the case, you can try algaefix marine to help subdue it.
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Current Tank: SPS dominated 150g DT w/ 55g sump, 10g plumbed refugium. Euphotica LEDs, DC return pump, Reef Octopus skimmer, Carbon/GFO reactor and an external dual chamber calcium reactor
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