Quick Stats
Care Level: Easy–Moderate
Temperament: Peaceful
Color Form: Natural Matte Green
Diet: Photosynthetic (calcifying macroalgae)
Reef Compatible: Yes
Lighting: Medium
Water Conditions: 72–78°F / 22–26°C, pH 8.0–8.4, dKH 8–12, sg 1.023–1.026
Growth Rate: Slow to Moderate
Origin: Tropical Marine Waters
Family: Halimedaceae
Overview
Halimeda opuntia is a highly ornamental calcifying green macroalgae prized for its extremely small, flat segments, the smallest within the Halimeda genus. This gives it a compact, delicate, and well-organized appearance, making it ideal for reef aquariums where proportion and fine detail are desired.
Unlike fast-growing macroalgae, Halimeda opuntia grows slowly and remains very stable and non-invasive. It incorporates calcium and carbonates into its structure, contributing to natural sediment formation and overall system stability. Best suited for mature reef aquariums, it thrives under medium lighting, low to moderate flow, and stable levels of calcium, alkalinity, and magnesium. Supplementation with iron and trace elements supports long-term health and coloration. Reef-safe and elegant, this species is an excellent choice for balanced, established reef systems.