Long Tentacle Plate coral is one of the most eye-catching LPS corals in the reef hobby because of its flowing tentacles, unusual movement, and dramatic showpiece appearance. Also known as Heliofungia actiniformis, this coral stands out in reef tanks because it combines the look of a plate coral with the motion of a much more animated species. This guide explains how to care for Long Tentacle Plate coral in a reef tank, including water parameters, lighting, flow, feeding, placement, and the most important warning signs to watch for over time.

For many reef keepers, Long Tentacle Plate coral is a coral they notice immediately. Its long waving tentacles create movement and texture that make the tank feel more alive, and a healthy specimen can become one of the most memorable corals in the whole aquarium. At the same time, this is not a coral to place carelessly. It needs stable conditions, smart placement, and regular observation to stay healthy long term.

Looking to add a standout LPS coral to your reef tank? Browse our LPS corals for sale and explore healthy corals for your aquarium.

What Is Long Tentacle Plate Coral?

Long Tentacle Plate coral is a large polyp stony coral known for its long flowing tentacles and plate-like base. Unlike many flatter plate corals that appear lower and more compact, this species creates much more visible motion in the aquarium and often becomes a natural centerpiece.

Because of its unique appearance, hobbyists are often drawn to it for display tanks where motion and coral personality matter just as much as color. When healthy, it can add a very natural reef look to the lower parts of an aquarium.

Why Long Tentacle Plate Coral Is So Popular

• It has long flowing tentacles that create strong movement
• It makes an excellent showpiece coral
• It adds texture and a natural reef look to the aquarium
• It stands out from more rigid or compact corals
• It brings a unique LPS appearance to mixed reef tanks

This coral is especially appealing to reef keepers who want a coral with both motion and visual impact rather than just color alone.

Water Parameters

Long Tentacle Plate coral requires a stable and clean environment to thrive. Like many fleshy LPS corals, it usually does best when water conditions are steady and not prone to major swings.

• Temperature: 76-82°F
• pH: 8.1-8.4
• Salinity: 1.023-1.025
• Nutrients: keep low and controlled
• Alkalinity: maintain in a stable healthy reef range
• Calcium: keep stable for skeletal support
• Magnesium: maintain in a normal reef range

Regular water changes and routine testing help keep this coral healthier over time. Stability matters more than constant correction.

If you are working on chemistry stability, read our guide on pH and alkalinity in reef tanks.

Lighting

Long Tentacle Plate coral usually does best under moderate to moderately high lighting. Strong lighting can work if introduced carefully, but too much intensity too quickly can stress the coral and increase the risk of bleaching.

• Moderate to moderately high lighting is usually best
• High-quality LED fixtures are a good option
• 8 to 10 hours of daily lighting is a practical working range
• Slow acclimation is safer than sudden exposure to stronger light

This coral often does best when light is strong enough to support health and color without placing it in the harshest hotspot in the tank.

If you want to understand reef lighting better, read our guide on reef tank lighting.

Water Flow

Long Tentacle Plate coral needs moderate water flow to keep its tentacles moving and to prevent debris from settling on the coral. The flow should be gentle enough to avoid tissue damage while still keeping the coral clean.

• Moderate indirect flow is usually ideal
• Use a gentle, randomized flow pattern when possible
• Avoid strong direct blasting from a powerhead
• Too little flow can allow detritus to settle on the coral

The best flow usually causes the tentacles to sway naturally instead of flattening them in one direction.

If you want to learn more about circulation, read our guide on water flow and coral health.

Feeding

Long Tentacle Plate coral is photosynthetic and receives much of its energy from zooxanthellae, but it also benefits from supplemental feeding. Thoughtful feeding often helps support stronger tissue condition and overall long-term health.

• Offer small meaty foods such as mysis shrimp, brine shrimp, or chopped squid
• Feed lightly and watch the coral’s response
• Avoid overfeeding because it can hurt water quality
• Use a steady routine rather than heavy feeding

In most reef tanks, small regular feedings work better than aggressive feeding that creates nutrient problems.

Placement

Placement is very important for Long Tentacle Plate coral because its fleshy tissue and long tentacles need room. It should usually be placed in a stable location where it can expand fully without rubbing against neighboring corals or sharp rockwork.

• Use a flat stable rock or coral rubble surface
• Give the coral enough room to grow and expand
• Keep it away from aggressive or stinging neighbors
• Avoid placing it directly in the path of a powerhead

This coral should never feel crowded. Extra space is one of the easiest ways to prevent long-term irritation and tissue damage.

Monitoring Its Health

Regular observation is one of the most important parts of caring for Long Tentacle Plate coral. Like many fleshy LPS corals, it often shows visible signs when something in the environment is off.

Watch for:

• Closed or retracted tentacles
• Loss of color
• Tissue recession
• Visible pests or irritation
• Failure to respond to stable conditions

If you notice these signs, review water quality, lighting, flow, and placement before the problem becomes more severe.

Common Long Tentacle Plate Coral Problems

Tissue Damage

This is often caused by harsh flow, poor placement, nearby aggression, or rough handling.

Poor Extension

If the tentacles stay withdrawn, common causes include water instability, excessive current, or long-term stress.

Discoloration

Lighting imbalance, nutrient issues, or system-wide stress can reduce the coral’s color over time.

Pests or Disease

New additions should be quarantined when possible so pests and infections are less likely to spread to valuable corals.

How to Tell If Long Tentacle Plate Coral Is Healthy

• Tentacles stay extended and moving naturally
• Tissue remains full and undamaged
• Color stays strong and stable
• The coral responds to feeding
• There is no visible tissue recession

A healthy Long Tentacle Plate coral usually looks calm, inflated, and active in the flow. A coral that stays tightly closed for too long is usually signaling that something needs to be corrected.

Best Tank Setup for Long Tentacle Plate Coral

Long Tentacle Plate coral usually does best in reef tanks with:

• Stable water chemistry
• Moderate to moderately high lighting
• Moderate indirect flow
• Open stable placement zones
• Regular observation and maintenance

It is a strong choice for hobbyists who want an LPS coral with dramatic movement and a true showpiece presence.

Related Corals You May Also Like

If you are interested in Long Tentacle Plate coral, you may also want to explore other fleshy LPS corals and related reef tank guides:

• Browse LPS corals for sale
• Fungia plate coral care guide
• Trachyphyllia coral guide
• Symphyllia coral care guide
• LPS corals overview

Ready to add a flowing showpiece coral to your reef tank? Browse our LPS corals for sale and explore healthy corals for your aquarium.

Shop Plate Corals and LPS Corals

Explore our WYSIWYG LPS corals, new arrival corals, and featured corals to build a more colorful reef tank.

Final Thoughts

Long Tentacle Plate coral is a rewarding and beautiful LPS coral when it is given stable water quality, balanced lighting, moderate flow, and thoughtful placement. With the right care, it can become one of the most memorable and visually active corals in a reef tank.

Frequently Asked Questions

Q: Is Long Tentacle Plate coral beginner friendly?
A: It is usually better for reef keepers with some experience, because stable care and proper placement matter a lot for long-term success.

Q: What lighting does Long Tentacle Plate coral need?
A: Moderate to moderately high lighting is usually a strong starting point, with slow acclimation to avoid stress.

Q: Does Long Tentacle Plate coral need feeding?
A: Yes, supplemental feeding can help. Small meaty foods often support better long-term condition.

Q: What flow is best for Long Tentacle Plate coral?
A: Moderate indirect flow is usually best because it keeps the coral clean without damaging delicate tentacles.

Q: Why is my Long Tentacle Plate coral closing up?
A: Common causes include excessive flow, unstable water parameters, lighting stress, poor placement, pests, or general irritation.

About the Author

Scott Shiles is the owner of ExtremeCorals.com, which he has operated for over 25 years and is recognized as one of the early dedicated live coral websites on the internet. A lifelong reef keeper since 1984, Scott has decades of hands-on experience maintaining marine aquariums and previously owned and operated a brick and mortar aquarium retail store for 10 years, including five years alongside Extreme Corals. He holds a degree in Marine Biology and has personally selected and sold hundreds of thousands of live corals. An avid scuba diver who has explored reef systems around the world, Scott shares practical coral care and husbandry knowledge based on real world reef experience.