Description

Halymenia maculata (Red Carpet / Red Macroalgae)

AT A GLANCE

Quick facts: Care level: Moderate · Lighting: Low–Moderate · Flow: Low · Feeding: Absorbs nutrients from water (no direct feeding required)

WHY SHOULD I BUY THIS ALGAE?

Halymenia maculata is a striking red macroalgae valued for its vibrant, deep red, carpet-like fronds. Its soft, wavy thalli provide visual contrast in reef tanks and refugiums while serving as an excellent habitat for copepods, amphipods, and other microfauna. Unlike some other red macroalgae, Halymenia can tolerate lower light conditions, making it a versatile addition for both refugiums and carefully maintained display tanks.

CARE LEVEL

Moderate
Best for aquarists with some experience maintaining stable water parameters.

WATER REQUIREMENTS & GENERAL CARE

Temperature: 24–28 °C
Salinity: 1.023–1.026 (32–35 ppt)
pH: 7.8–8.4
Nitrates (NO₃): 2–15 ppm
Phosphates (PO₄): 0.01–0.05 ppm

Stable water chemistry and moderate nutrient levels are important for deep coloration and healthy growth.

LIGHTING

Low–Moderate
Photoperiod: 10–14 hours/day

Prefers indirect or subdued lighting; bright light may cause bleaching or discoloration.

PLACEMENT

Refugium or Low-Light Display Areas
Can be loosely anchored on sand, rubble, or low rockwork

Ensure fronds have gentle circulation and are not smothered by stronger macroalgae.

FLOW

Gentle movement keeps detritus from accumulating on fronds and encourages healthy growth.

FEEDING

Photosynthetic: No direct feeding required
Nutrient Requirements: Absorbs dissolved nitrates, phosphates, and trace elements from water

Regular pruning prevents overgrowth and supports nutrient export in the system.

COMPATIBILITY & BEHAVIOR

Temperament: Passive
Safe for all reef fish and invertebrates
Provides microhabitat for copepods, amphipods, and other small fauna
Does not attach aggressively or sting corals

ADDITIONAL INFORMATION

Family: Halymeniaceae
Origin: Indo-Pacific and tropical Atlantic regions
Natural Habitat: Shallow reef flats, sheltered lagoons, and tide pools with gentle water flow
Growth Form: Thin, wavy, carpet-like red thalli

WHY WE RECOMMEND THIS ALGAE

✔ Unique red coloration and carpet-like appearance
✔ Provides habitat for microfauna and beneficial organisms
✔ Hardy in low-light, nutrient-stable environments
✔ Adds natural aesthetic to refugiums and display tanks

DISCLAIMER