Cladophora

Visual and Physical Identification

Cladophora generally manifests as thick, wiry, dark green tufts interwoven with mosses or carpeting plants.

• Textural Resilience: Unlike Spirogyra, which turns to mush when rubbed, Cladophora maintains its stiff, bristly structure when pulled from the water.
• Branching Morphology: Under magnification, distinct lateral branching of the filaments is clearly visible.
• Parasitic Entanglement: It exhibits a devastating tendency to grow directly through the rhizomes of Eleocharis (hairgrass) or the fronds of Taxiphyllum (mosses), making mechanical separation almost impossible without destroying the host plant.

Proliferation Mechanisms

1. Inadequate Circulation: Cladophora thrives in the intricate, stagnant micro-environments found deep within thick moss patches or dense carpeting plants where flow and CO2 distribution fail to reach.
2. High PAR Thresholds: Like most chlorophytes, it demands intense lighting to sustain its thick cellular architecture. Shaded tanks rarely suffer severe Cladophora outbreaks.
3. Cross-Contamination: It is almost exclusively introduced via contaminated nursery plants, particularly imported mosses and hardscape materials. Spores are highly resistant to desiccation.

Eradication Protocols

• Targeted Chemical Necrosis: Cladophora is notorious for its resistance to standard glutaraldehyde (e.g., Flourish Excel (Carbon)) water-column dosing. However, direct, localized spot-treatment with 3% Hydrogen Peroxide via a syringe directly into the algae mat causes rapid oxidation and death.
• Manual Extraction: Due to its wiry nature, it can be physically plucked using aquascaping tweezers, though any microscopic fragment left behind will regenerate into a new colony.
• Biological Grazers: Only the Caridina multidentata (Amano Shrimp) possesses the necessary mandibular strength to process and consume the tough Cladophora cell walls, though they require to be starved of fish food to be motivated.

Prophylactic Quarantine

1. Plant Quarantine and Dipping: Never introduce new mosses or carpeting plants without a prophylactic dip (either a highly diluted bleach solution or H2O2 bath) to destroy latent spores.
2. Micro-Flow Management: Ensure that powerheads or filter outflows are angled to provide subtle, continuous flow through dense thickets of plants, disrupting the stagnant boundary layers Cladophora exploits.
3. Macronutrient Homeostasis: Maintain a flawless fertilization regime. Complete fertilizers like Premium Nutrition keep the host plants' metabolic rates high, outcompeting the algae.