Bryopsis is a tough fern-like macroalgae that's notoriously hard to remove. Once established it dominates rockwork and resists most CUC species.
Hitchhiked in on rock or coral; sustained phosphate or iron excess fuels growth.
Always treat in a separate quarantine tank.
Dip every new piece. Quarantine new rock. Monitor magnesium for accidentally low levels.
Fern-shaped feather-like green growth. Bright green color. Resists most snails + crabs.
Hitchhiked in on rock or coral; sustained phosphate or iron excess fuels growth.
Magnesium elevation (Tech-M): Raise magnesium to 1600-1800 ppm (using Kent Marine Tech-M specifically) for 4-6 weeks. Bryopsis dies; most coral tolerates the elevated Mg. Drop back to normal range after.
Dip every new piece. Quarantine new rock. Monitor magnesium for accidentally low levels.
Moderate - cosmetic + competitive with coral
Browse the full disease database for 45 aquarium conditions with treatment protocols, or check the care library for prevention-focused husbandry guides. Use our symptom matcher to rank likely diseases from observed signs, the water parameter checker to diagnose related water-quality issues, or the QT timeline calculator to plan a treatment schedule.