Acan Placement Reef Tank – The Ultimate Guide To Healthy, Vibrant
Finding the perfect spot for a new coral can feel like a high-stakes game of musical chairs. You want your new addition to thrive, but every reef tank has its own unique micro-climates of light and flow.
If you have recently added a “Lord” or “Bower” to your collection, mastering acan placement reef tank strategies is the single most important step you can take toward long-term success.
In this guide, we will walk through the specific lighting, flow, and spacing requirements needed to make your Acans explode with color. By the end of this article, you will know exactly where to glue your frag for maximum growth and health.
Understanding Your Micromussa: Why Acans are the Jewels of the Reef
Before we dive into the logistics, it is helpful to understand what these corals actually are. Most hobbyists still use the term “Acan,” even though the most popular species, Acanthastrea lordhowensis, was reclassified as Micromussa lordhowensis a few years ago.
Despite the name change, their care remains the same. These are Large Polyp Stony (LPS) corals known for their incredible “donut” shapes and almost infinite color variations.
They are generally considered hardy, making them a fantastic choice for beginners. However, their fleshy bodies make them sensitive to improper placement, which can lead to tissue recession if you aren’t careful.
The Golden Rules for Acan Placement Reef Tank Success
When it comes to an acan placement reef tank setup, consistency is your best friend. These corals prefer stability over “perfect” numbers that fluctuate wildly.
The primary goal of placement is to mimic the lower-energy environments where these corals are found in the wild. They typically inhabit deeper reef slopes or protected lagoons where the water isn’t quite as turbulent.
If you place them in a high-energy zone, their fleshy polyps will stay retracted to protect themselves from the skeletal structure beneath. This prevents them from feeding and eventually leads to starvation.
Lighting Requirements: Finding the Sweet Spot
Acans are not high-light corals. In fact, one of the most common mistakes beginners make is placing them too high in the rockwork under intense LED or T5 lighting.
Ideally, you are looking for a PAR range of 50 to 150. If your lights are particularly powerful, the bottom third of the tank is usually the safest bet.
If you notice your Acan is turning pale or white, it is likely getting too much light. Conversely, if it is turning a dull brown, it might need just a little more “oomph” from your light fixture.
Water Flow Dynamics: Keeping the Polyps Happy
Flow is the second pillar of a successful acan placement reef tank. These corals have very heavy, fleshy mantles that catch the current like a sail.
You want low to moderate, indirect flow. The goal is to see the polyps gently swaying in the current without being flattened against their own skeleton.
Direct flow is a death sentence for Micromussa. Constant high pressure can cause the sharp septa (the “teeth” of the skeleton) to tear the coral’s tissue from the inside out, leading to infections like Brown Jelly Disease.
Chemical Warfare: Managing Spacing and Aggression
While they look soft and inviting, Acans are surprisingly capable of defending their territory. They possess mesenterial filaments and short sweeper tentacles that they use to attack neighboring corals.
Providing Adequate Buffer Zones
When planning your acan placement reef tank, always leave at least two to three inches of space between an Acan and a different genus of coral.
Interestingly, most Micromussa lordhowensis colonies can be placed right next to each other. They will often grow together to form a beautiful, multi-colored “Acan garden” without stinging one another.
However, be very careful with Micromussa bowerbanki. These are much more aggressive and will likely consume smaller “Lords” if they come into contact.
Compatibility with Other LPS
Acans generally play well with others as long as they aren’t being touched. However, you must watch out for more aggressive neighbors like Galaxea or Torch corals.
Torches have long sweeper tentacles that can reach out several inches at night. If an Acan gets stung, it will quickly retract and may suffer permanent tissue loss if the placement isn’t adjusted.
The Sand Bed vs. Rockwork Debate
One of the most frequent questions hobbyists ask is whether they should put their Acans on the sand or on the rocks. Both have pros and cons, but the choice often comes down to your flow levels.
Benefits of the Sand Bed
The sand bed is the “classic” acan placement reef tank choice. It provides the lowest light levels and usually the most consistent, gentle flow.
Keeping them on the sand also makes it incredibly easy to move them if they show signs of stress. Plus, there is something visually stunning about a cluster of bright Acans sitting on clean white sand.
The only downside is the risk of sand-sifting organisms. If you have a Diamond Goby or large snails, they might accidentally flip your coral or cover it in sand, which can irritate the polyps.
Benefits of Rockwork Placement
Placing Acans on the rockwork allows you to create more vertical interest in your scape. This is ideal if your sand bed is already crowded with Scolymia or Trachyphyllia.
If you choose the rocks, look for flat plateaus or crevices in the lower half of the tank. Use a small amount of underwater epoxy or super glue gel to secure the plug so it doesn’t get knocked over by crabs.
Ensure the surface is relatively horizontal. If an Acan is mounted at a sharp vertical angle, it may struggle to catch food particles during your target feeding sessions.
Feeding and Growth: How Placement Impacts Nutrition
While Acans get a portion of their energy from photosynthesis, they are voracious eaters. Their growth rate will triple if they are fed regularly.
Daytime vs. Nighttime Feeding
When you find the right acan placement reef tank location, you will notice the coral extending its feeding tentacles shortly after the lights go out.
You can also “train” them to eat during the day by broadcasting a little bit of liquid food into the water column. Once they smell the nutrients, their polyps will swell, and the tentacles will emerge.
Feeding is much easier when the coral is placed in a low-flow area. If the flow is too high, the food will simply blow away before the coral can pull it into its mouth.
Recommended Foods
- Mysis shrimp (chopped)
- Reef roids or other powdered coral foods
- LPS pellets
- Brine shrimp
Monitoring Health: Signs Your Placement Needs to Change
Even with the best planning, sometimes a coral just isn’t happy. As an observant reef keeper, you need to recognize the early warning signs of a bad location.
Signs of Too Much Light
If the colors of your Acan are “washing out,” it is likely a sign of photo-inhibition. The coral is producing too much oxygen internally, which becomes toxic.
You might also see the coral staying tightly closed even when the lights are at their peak. If this happens, move the frag to a shaded area or lower it further down the rockwork.
Signs of Too Much Flow
If you can see the white “ribs” of the skeleton through the tissue, your flow is likely too high. The polyps should look like puffy marshmallows.
If the tissue looks stretched or thin, try placing a piece of rock in front of the coral to act as a windbreak. This creates a low-pressure zone that allows the coral to relax and expand.
Step-by-Step Guide to Acclimating a New Acan
Don’t worry—this setup is perfect for beginners! Just follow these simple steps to ensure a smooth transition for your new coral.
- Dipping: Always dip your new Acans in a coral cleaner (like Revive or Coral RX) to remove pests like polyclads or spiders.
- Temperature Acclimation: Float the bag for 15-20 minutes to match the tank temperature.
- The “Low and Slow” Start: Place the coral on the sand bed in a low-light area for the first week.
- Observation: Watch for polyp extension. If the coral looks happy after 7 days, you can move it to its permanent home.
- Securing: Once you are happy with the spot, use a tiny amount of glue to prevent “frag-tipping” by curious snails.
FAQ: Common Questions About Acan Care
Do Acans need high nitrates?
While they don’t need “dirty” water, they do prefer slightly elevated nutrients. A nitrate level of 5-10 ppm and phosphate around 0.03-0.08 ppm usually results in the best colors and growth.
Can different Acan species touch?
Micromussa lordhowensis can usually touch other lordhowensis. However, you should never let them touch Micromussa bowerbanki or Acanthastrea echinata, as these are much more aggressive.
Why is my Acan not opening?
Check your alkalinity first. LPS corals are very sensitive to alkalinity swings. If your parameters are stable, the issue is almost certainly too much light or too much flow.
How fast do they grow?
With regular feeding (2-3 times a week), a single polyp can sprout two or three babies in a month. Without feeding, growth is significantly slower.
Conclusion: Creating Your Perfect Acan Garden
Mastering acan placement reef tank techniques is all about observation and patience. These corals are incredibly rewarding because they react so visibly to their environment.
When you find that “sweet spot” where the light is soft and the flow is a gentle breeze, your Acans will reward you with explosive colors and puffy, healthy polyps.
Remember to start low, keep the flow indirect, and give them plenty of space to grow. Your reef tank will soon feature a vibrant, living tapestry that is the envy of the local fish store!
Happy reefing, and don’t be afraid to experiment until your corals look their absolute best!
