Heteractis malu Yellow Anemone M | 20 cm

Overview

Heteractis malu, often sold as the yellow sebae-type anemone, is a beautiful marine anemone prized for its elegant tentacles, pale to yellow colouration, and potential to host clownfish. This medium-sized specimen is approximately 20 cm and makes an eye-catching centrepiece for a well-established saltwater aquarium.

As with all true anemones, Heteractis malu is not a beginner species. It requires a mature tank, excellent water quality, stable salinity, and careful placement in suitable substrate. When kept correctly, it can become a long-lived and rewarding display animal. Please note that anemones are sensitive to changes in water chemistry and lighting, so they should only be purchased by aquarists with experience in marine systems.

At Tropical Fish Co, we pack livestock with care and offer a live arrival guarantee plus fast UK delivery, helping your new anemone arrive in the best possible condition.

Care at a Glance

Origin & Natural Habitat

Heteractis malu is found in the Indo-Pacific, where it inhabits shallow coastal reef environments, sandy lagoons, and protected reef flats. In nature, it typically anchors its pedal disc deep in sand or fine rubble, often with the oral disc exposed above the substrate. This species relies on a combination of strong lighting and symbiotic zooxanthellae for much of its nutrition, while also capturing small food particles from the water column.

Its natural habitat is warm, clear, and highly stable, with gentle to moderate water movement. These conditions are important to replicate in the aquarium. Because it is often found partially buried in sand, the anemone should never be forced onto rockwork if it is trying to settle into substrate.

Tank Setup & Water Parameters

A successful setup for Heteractis malu starts with a mature marine aquarium that has been running for several months, ideally longer. Stability is far more important than chasing exact numbers. The tank should have strong, reef-quality lighting, consistent salinity, and low nutrient levels. A sand bed of suitable depth is strongly recommended, as this species prefers to anchor its foot in soft substrate.

Provide a secure aquascape with no sharp edges or unstable rocks that could collapse if the anemone moves. Powerheads and overflow intakes should be protected with guards, as anemones can wander and become injured or damage equipment. Moderate flow is best: enough to keep the tentacles gently moving, but not so strong that the animal is blasted or unable to expand fully.

Recommended parameters:

• Temperature: 24–27°C
• Salinity: 1.024–1.026 specific gravity
• pH: 8.1–8.4
• Ammonia and nitrite: 0
• Nitrate: ideally low, under 10–20 ppm

Acclimation should be slow and careful, using a drip method where possible. Avoid exposing the anemone to air for long periods, and do not place it forcefully into the tank. Instead, allow it to settle naturally into the sand and choose its own position. Good lighting is essential, but any increase in intensity should be gradual to prevent bleaching or stress.

Feeding Guide

Heteractis malu is photosynthetic, meaning it gains a significant portion of its energy from light via symbiotic algae. However, regular supplemental feeding helps support growth, recovery, and long-term health. Offer small portions of marine meaty foods such as mysis shrimp, chopped prawn, krill, or finely diced fish flesh.

Feed sparingly, usually once or twice per week, and only offer food that the anemone can fully accept and digest. Overfeeding can lead to water quality issues and regurgitation. If the anemone is newly introduced, stressed, or still settling, wait until it is firmly attached and fully open before attempting to feed.

As with all anemones, avoid feeding large chunks. Small, manageable pieces are much safer and easier for the animal to process. A healthy specimen should display a responsive feeding reaction and remain inflated under suitable conditions.

Tank Mates / Compatibility

Heteractis malu can be compatible with certain reef-safe fish, especially clownfish species that naturally associate with anemones. However, compatibility is always dependent on tank space, individual temperament, and the anemone’s ability to remain undisturbed. Because it can sting, it should be given plenty of room away from corals and sessile invertebrates.

Good tank mates include many peaceful reef fish that will not nip or harass the anemone, such as clownfish, gobies, blennies, firefish, and small wrasses where appropriate. Avoid butterflyfish, angelfish that nip at invertebrates, aggressive species, and any fish known to pick at anemones. Also avoid placing it close to LPS, soft corals, zoanthids, and other delicate invertebrates that may be damaged by contact.

Remember that anemones can move. Even if placed carefully, they may relocate until they find the right light, flow, and substrate. This means a reef-safe layout with plenty of spacing is essential.

Why Buy from Tropical Fish Co

We understand that buying a live marine anemone online requires trust, careful packing, and reliable delivery. That is why Tropical Fish Co focuses on healthy livestock, professional handling, and customer support that helps you succeed. Your Heteractis malu is packed with attention to temperature, oxygenation, and transit safety, and sent with our fast UK delivery service to reduce time in transit.

We also provide a live arrival guarantee for peace of mind, so you can shop with confidence. Whether you are adding a centrepiece to a mature reef tank or looking to house clownfish in a natural symbiosis, we aim to supply robust, well-presented specimens that are ready for careful acclimation and long-term care.

For best results, ensure your aquarium is fully cycled, stable, and appropriately lit before ordering. With the right setup, Heteractis malu can become a spectacular and rewarding addition to your marine collection.