Black Widow Anemone for Sale – A Striking and Dramatic Anemone for Reef Aquariums

Few invertebrates in the reef hobby make as bold and immediate a visual statement as the Black Widow Anemone (Entacmaea quadricolor black variant). With its deep, dramatic coloration ranging from rich chocolate brown to near black, contrasting pale tentacle tips, and the flowing, bubble-tipped tentacles characteristic of its species, this striking color morph of the Bubble Tip Anemone is one of the most sought-after anemone variants available to dedicated reef aquarists. At Dr. Reef Quarantined Fish, every Black Widow Anemone is carefully observed and confirmed healthy before it ships to you.

A Color Morph Worth Seeking Out

The Black Widow Anemone is a color variant of the Bubble Tip Anemone, one of the most widely kept and best understood anemone species in the reef hobby. While the standard Bubble Tip is available in green, rose, and orange morphs, the black variant is considerably less common in the trade and generates significant interest among collectors and reef aquarists who appreciate the dramatic contrast it brings to a well-lit reef system. Its dark coloration, which can appear almost black under certain lighting conditions and reveals rich brown and purple undertones under intense reef lighting, creates a striking focal point in any system fortunate enough to house a healthy specimen.

Appearance

The Black Widow Anemone shares the characteristic bubble-tipped tentacles of the broader Entacmaea quadricolor species, with the rounded, inflated tips that give the group its common name appearing most prominently when the anemone is well fed and settled. The column and oral disc display the deep, near-black coloration that defines this morph, while the tentacle tips often carry a paler contrast that emphasizes the darkness of the rest of the body. Under strong reef lighting the full depth of the coloration becomes apparent, with subtle iridescence that adds further visual interest to an already exceptional specimen. Size at the point of sale typically ranges from 3 to 6 inches in oral disc diameter, with healthy specimens capable of expanding considerably larger in a well-established system.

Aquarium Requirements

The Black Widow Anemone requires a mature, stable reef system to thrive. A minimum of 30 gallons is recommended, with larger systems providing more stable water chemistry and a greater margin of error that benefits the anemone over the long term. Water quality must be maintained at a consistently high standard, with stable salinity, low nitrate and phosphate levels, and excellent water clarity. Anemones are among the most sensitive invertebrates to parameter fluctuations and do not tolerate ammonia or nitrite at any detectable level. A mature biological filter and disciplined maintenance routine are non-negotiable requirements for keeping this species successfully.

Strong lighting is important for the long-term health of the Black Widow Anemone, as it hosts photosynthetic zooxanthellae algae within its tissues that contribute significantly to its nutritional needs. Quality LED reef lighting or T5 fluorescent systems capable of delivering high par values across the aquarium are well suited to this species. The anemone should be allowed to find its own position within the aquarium rather than being placed in a specific location, as it will move until it finds the light intensity and flow conditions that suit it best.

Feeding

While the Black Widow Anemone obtains a significant portion of its energy from the photosynthetic activity of its zooxanthellae, regular feeding with meaty marine foods supports its growth, health, and reproductive potential. Offering appropriately sized pieces of shrimp, silversides, mysis shrimp, or other meaty marine foods directly to the tentacles once or twice per week provides a reliable nutritional supplement. Feeding should be sized appropriately to avoid overwhelming the anemone with portions it cannot process, and uneaten food should be removed promptly to protect water quality.

Clownfish Hosting

One of the most celebrated aspects of keeping any Bubble Tip Anemone variant is the potential for clownfish hosting. The Black Widow Anemone is a natural host for several clownfish species, with Ocellaris and Percula Clownfish being the most commonly paired in captivity. Observing a clownfish pair establish residency in a Black Widow Anemone, with the dark coloration of the anemone providing a dramatic backdrop to the vivid orange and white of the clownfish, creates one of the most visually striking displays available in the reef hobby. Introducing a compatible clownfish pair alongside the anemone in a well-established system gives the best chance of a successful and lasting hosting relationship.

Temperament and Placement

The Black Widow Anemone is a predatory invertebrate with stinging tentacles that can harm corals, fish, and other invertebrates that come into contact with them. Adequate space should be maintained between the anemone and neighboring corals to prevent contact as the anemone expands and moves through the system. Aquascape planning that anticipates the movement range of the anemone and positions corals and equipment accordingly is an important part of managing this species responsibly in a mixed reef system.

Why Buy from Dr. Reef

At Dr. Reef Quarantined Fish, every Black Widow Anemone is carefully observed and confirmed healthy before being offered for sale. Each specimen is held under stable, well-maintained conditions and monitored for expansion, feeding response, and overall health before it ships. Anemones that arrive in strong, healthy condition from a trusted source establish far more quickly and reliably than those shipped under poor conditions, and the investment in a properly prepared specimen from a reputable operation is one of the most important decisions a reef aquarist can make when adding this striking and sensitive invertebrate to their system.