Gelidium (Red Wiry Turf Algae) is a reef aquarium nuisance that can spread if early signs are ignored.
Identification: Tough red wiry tufts that grip rock tightly and regrow from holdfasts after incomplete removal.
Treatment / Management: Manual extraction with holdfast removal, repeated spot control, and nutrient reduction to limit regrowth.
Prevention: Inspect and quarantine frags and rock, and remove early colonies before they spread.
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