How Often Do You Feed Corals – The Ultimate Reef Tank Guide

You’ve spent weeks cycling your tank, carefully aquascaping your live rock, and finally adding those stunning, fluorescent splashes of life to your reef. But now, you’re standing in front of the glass with a bottle of liquid plankton, wondering if you’re doing it right.

If you feel a bit overwhelmed by conflicting advice on how often do you feed corals, you are certainly not alone. Many hobbyists struggle to find the “sweet spot” between starving their reef and crashing their water chemistry with excess nutrients.

Don’t worry—getting your feeding schedule right is easier than it looks once you understand the biological needs of your specific inhabitants. In this guide, we will break down the exact schedules, food types, and methods to help your corals thrive and grow.

Understanding the Basics: Why Do Corals Need Food?

To answer how often do you feed corals, we first have to look at how they eat in the wild. Most corals are mixotrophic, meaning they get their energy from two primary sources: light and organic matter.

The majority of a coral’s energy comes from zooxanthellae, which are tiny photosynthetic algae living inside their tissues. These algae provide sugars through photosynthesis, but they don’t provide everything a coral needs to build its skeleton and reproduce.

Corals also have mouths and stinging cells called nematocysts to catch prey. In a closed aquarium system, they rely on us to provide the proteins, amino acids, and minerals they can’t get from light alone.

Photosynthesis vs. Active Feeding

Think of light as the “bread and butter” of a coral’s diet, while active feeding is the “protein shake.” While some corals can survive on light alone, they won’t show the same vibrant colors or rapid growth rates without supplemental feeding.

If you want to see those spectacular polyp extensions and thick skeletal growth, you have to bridge the gap by offering high-quality coral foods. This is where a consistent feeding routine becomes your best friend.

How Often Do You Feed Corals for Optimal Health?

As a general rule for most mixed reef tanks, feeding two to three times per week is the gold standard. This frequency provides enough nutrition for growth without overwhelming your biological filtration system.

However, the question of how often do you feed corals depends heavily on the “nutrient export” capabilities of your tank. If you have a massive protein skimmer and a lush refugium, you might be able to feed daily.

If you are running a smaller nano-reef with simple filtration, feeding once a week might be safer to prevent nuisance algae outbreaks. It is always better to start slowly and increase frequency as you monitor your water parameters.

The “Low and Slow” Approach

For beginners, I always recommend the “low and slow” approach. Start by feeding twice a week and keep a close eye on your Nitrate (NO3) and Phosphate (PO4) levels.

If your levels stay stable and your corals look “plump” and happy, you can try increasing the frequency. If you notice a film of green algae on the glass or hair algae on the rocks, it’s a sign to scale back.

Determining How Often Do You Feed Corals Based on Species

Not all corals are created equal, and their metabolic needs vary wildly. A fleshy LPS coral has a much larger “stomach” than a tiny-polyped SPS coral, and their schedules should reflect that.

Soft Corals (Zoanthids, Mushrooms, Leathers)

Soft corals are generally very hardy and can often survive just fine on fish waste and light. However, Zoanthids and Palythoas respond incredibly well to feeding once or twice a week.

Feeding these beauties finely powdered foods or liquid suspensions can lead to faster colony spreading. Since they are efficient at absorbing nutrients from the water, you don’t need to be as aggressive with their schedule.

LPS Corals (Large Polyp Stony)

LPS corals, such as Acanthophyllia, Micromussa, and Euphyllia (Torches and Hammers), are the “big eaters” of the reef world. They have large, visible mouths and can consume meaty foods like mysis shrimp.

For LPS-dominant tanks, feeding two to three times per week is ideal. Many reefers find that “spot feeding” these corals directly results in massive “inflation” and much faster tissue growth.

SPS Corals (Small Polyp Stony)

SPS corals like Acropora and Montipora have tiny polyps that capture microscopic particles. They rely more heavily on light, but they still need amino acids and bacterioplankton to maintain their intense colors.

When considering how often do you feed corals in an SPS-heavy tank, many experts prefer small, daily doses of liquid supplements rather than one large weekly feeding. This keeps the water nutrient-rich but stable.

Non-Photosynthetic (NPS) Corals

These are the “expert level” corals, such as Sun Corals or Gorgonians. Because they do not have zooxanthellae, they cannot eat light. They must be fed daily, and sometimes multiple times a day, to survive.

The Best Types of Food for Your Reef

Now that we’ve covered the “how often,” let’s talk about the “what.” Providing a variety of foods ensures that you are meeting the diverse nutritional requirements of different species.

1. Phytoplankton

Phytoplankton are microscopic algae that form the base of the food chain. While most corals don’t eat phytoplankton directly, it feeds the copepods and rotifers that your corals eventually consume.

Adding live phytoplankton to your tank is one of the best ways to boost the overall biodiversity of your ecosystem. It’s almost impossible to “overfeed” with live phyto, as it helps consume excess nutrients before it dies.

2. Zooplankton and Particulate Foods

This category includes rotifers, cyclops, and powdered “reef roids.” These are excellent for broadcast feeding and are small enough for almost any coral polyp to capture.

These foods are high in protein and fatty acids. They are the primary fuel for SPS corals and smaller-polyped LPS. Because these are often dried or frozen, you must be careful not to let the leftovers rot in the sand bed.

3. Meaty Foods (Mysis and Brine Shrimp)

If you have Duncans, Plate Corals, or Brain Corals, they will love a direct offering of mysis shrimp. These chunky meals provide a massive caloric boost that helps corals recover from stress or injury.

Always thaw frozen foods in a cup of tank water before feeding. This prevents a “temperature shock” to the coral’s delicate internal tissues and allows you to drain off the excess “packing juice” which is often high in phosphates.

4. Amino Acids

Amino acids are the building blocks of protein. Many modern reefers dose amino acids daily. This isn’t “feeding” in the traditional sense, but it stimulates the coral’s feeding response and helps them process light more efficiently.

Target Feeding vs. Broadcast Feeding

When you decide how often do you feed corals, you also need to decide on the method. Both have pros and cons, and many hobbyists use a combination of both.

The Precision of Target Feeding

Target feeding involves using a turkey baster or a specialized coral feeder syringe to gently puff food directly onto the coral’s polyps. This is the most efficient way to ensure your corals are actually eating.

Pro-tip: Turn off your wavemakers and return pumps for 15-20 minutes during target feeding. This allows the food to settle on the corals without being blown away into the filtration system.

This method is great for LPS corals but can be time-consuming. However, it significantly reduces waste because you aren’t just “dumping” food into the water column and hoping for the best.

The Ease of Broadcast Feeding

Broadcast feeding is the “shotgun” approach. You mix your food into a cup of tank water and pour it into a high-flow area of the tank. The current carries the particles to every nook and cranny of the reef.

This is the best method for large colonies of SPS or Soft corals where target feeding every single polyp is impossible. The downside is that it can lead to higher nutrient levels if your filtration isn’t up to the task.

Signs You Are Overfeeding Your Corals

It is very easy to get carried away. We love our corals and want them to grow as fast as possible, but overfeeding is the number one cause of tank crashes for intermediate keepers.

If you are feeding too frequently, your water chemistry will shift. Watch out for these red flags:

• Cyano Bacteria: That slimy red or maroon carpet on your sand is often a sign of excess dissolved organics.
• Hair Algae: If your rocks are starting to look like a lawn, you have too many phosphates.
• Cloudy Water: A bacterial bloom can occur if there is too much uneaten food rotting in the system.
• Tissue Recession: Paradoxically, too much food can lead to high nitrates that actually stress and kill sensitive corals.

If you see these signs, don’t panic! Simply perform a 20% water change, reduce your feeding frequency by half, and check your protein skimmer to make sure it’s functioning correctly.

Signs Your Corals Are Hungry

On the flip side, some reefers run their tanks “too clean.” If you have zero nitrates and zero phosphates (often called ULNS or Ultra Low Nutrient System), your corals might actually starve.

Look for these signs that it’s time to increase how often do you feed corals:

• Pale Colors: If your bright pink Acropora is turning a ghostly white or dull brown, it may lack nutrition.
• Retracted Polyps: If the polyps haven’t come out in days, the coral might be trying to conserve energy.
• Thin Tissue: If the coral looks “tight” against its skeleton with no “fleshiness,” it needs a meal.

A healthy coral should look “fat” and extended. If your tank looks sterile, don’t be afraid to add an extra feeding session during the week. Corals love a little bit of “dirt” in the water!

The Best Time of Day to Feed

Timing is everything! In nature, many corals are nocturnal feeders. They extend their feeding tentacles at night to avoid predators and to catch the zooplankton that rises to the surface after sunset.

Try feeding your tank about 30 minutes after the lights go out. Use a red flashlight to look at your corals—you’ll be amazed at the long, translucent tentacles reaching out into the water!

Feeding at night can often result in a much better feeding response, especially for “finicky” LPS corals. However, if your corals have adapted to daytime feeding, there’s no need to change a schedule that is already working.

Essential Tools for Coral Feeding

To make the process easier and more effective, you might want to invest in a few simple tools. These will help you master the art of how often do you feed corals without making a mess.

• Target Feeder/Baster: A long acrylic tube with a bulb at the end. This allows you to reach the bottom of the tank without getting your arms wet.
• Specimen Container: Use this to thaw frozen food and mix it with tank water or amino acid supplements.
• Mesh Sieve: Perfect for rinsing the “phosphaty” liquids off of frozen mysis or brine shrimp.
• Feeding Shield: For very slow-eating corals like Acanthophyllia, some hobbyists use a cut-off soda bottle to cover the coral, preventing fish or shrimp from stealing the food.

Frequently Asked Questions (FAQ)

Can corals survive without being fed?

Yes, many photosynthetic corals can survive on light and the nutrients produced by fish waste. However, they will grow much slower and may not reach their full color potential. Non-photosynthetic corals will die without regular feeding.

Do I need to turn off the protein skimmer when feeding?

It is a good idea to turn off your skimmer for about 30-60 minutes after feeding. This prevents the skimmer from immediately removing the expensive coral food you just added to the water.

What happens if I miss a feeding?

Don’t worry! Corals are very resilient. Missing a feeding for a week or even two (like when you are on vacation) will not harm a healthy reef tank. They will simply rely more on their zooxanthellae for energy during that time.

Can I feed my corals “human food”?

While some people feed small bits of raw, unseasoned seafood (like shrimp or scallops), it is generally safer to stick to dedicated aquarium foods. Human-grade seafood can sometimes contain preservatives or pathogens not suitable for a reef tank.

How often do you feed corals in a brand-new tank?

In a new tank (less than 3 months old), I recommend feeding very sparingly—perhaps once a week. New tanks are prone to “ugly stages” like diatoms and hair algae, and excess food will only fuel those outbreaks.

Conclusion: Finding Your Reef’s Rhythm

Mastering how often do you feed corals is one of the most rewarding parts of the reef-keeping hobby. It transitions you from being a “tank owner” to being a true “reef gardener.”

Remember, there is no single “perfect” schedule that fits every aquarium. Your tank is a living, breathing ecosystem that will give you signals if it needs more or less food. By starting with a twice-weekly schedule and observing your coral’s reaction, you’ll find the perfect balance.

Keep your water parameters stable, choose high-quality foods, and enjoy the incredible sight of your corals growing and thriving. Happy reefing, and don’t be afraid to experiment to see what makes your specific corals pop with color!