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Gha Marina

Green Seaweed (GHA Marina)

Scientific name: Chaetomorpha linum, Bryopsis pennata, various marine Cladophora species Color: Medium green, bright green Appearance: Green, thread-like strands similar to freshwater GHA, but often thicker and sturdier.

Where is it found?: Live rock, decoration, back of the sump.

Is it dangerous?: Not directly, but it can suffocate corals if it covers them.

Main causes:

  1. Nitrates (NO₃) > 5–10 ppm
  2. Phosphates (PO₄) > 0.05–0.1 ppm
  3. Little movement in areas of the rock

How to remove it:

  • Biological: Tang (surgeonfish) — especially Zebrasoma flavescens (yellow tang), Ctenochaetus (kole tang). Foxface (Siganus vulpinus). Emerald crabs (Mithraculus sculptus) for algae in crevices.
  • Instructions: Remove manually with your fingers or tweezers.
  • Shelter with Chaeto: Cultivate Chaetomorpha (a non-invasive GHA) in the shelter as a nutrient exporter—it competes with invasive algae.
  • Skimmer: Optimize the skimmer to remove more organic matter.
  • Nitrate and Phosphate Reactor (NP Reducer): Carbon pellets for nutrient reduction.
  • Remove with H₂O₂: Use on removable decorations only; do not use inside the aquarium with corals.