One of the biggest mistakes in reef keeping is assuming that all corals thrive under the same conditions.

A hobbyist purchases a beautiful Acropora and places it next to a Torch Coral.

The water parameters look good.

The reef salt is high quality.

The lighting schedule remains unchanged.

Yet one coral flourishes while the other slowly declines.

Why?

Because SPS and LPS corals evolved in different environments and have different biological needs.

Understanding these differences is one of the most important steps toward building a successful reef aquarium.

What Are SPS and LPS Corals?

SPS stands for Small Polyp Stony corals.

These corals typically have small polyps and rigid calcium carbonate skeletons. Popular SPS species include:

• Acropora
• Montipora
• Pocillopora
• Stylophora
• Seriatopora

LPS stands for Large Polyp Stony corals.

These corals generally have larger, fleshy polyps and slower feeding responses. Common LPS species include:

• Euphyllia (Torch, Hammer, Frogspawn)
• Acanthastrea
• Favia
• Blastomussa
• Trachyphyllia

Both SPS and LPS can create stunning reef displays, but they require different approaches.

SPS Corals: The Specialists

SPS corals are often considered more challenging because they are highly sensitive to instability.

In natural reefs, many SPS species inhabit shallow, high-energy zones with intense sunlight and strong water movement.

As a result, SPS corals generally prefer:

• Stable alkalinity
• Strong, turbulent flow
• Moderate to high PAR lighting
• Stable salinity
• Lower nutrient environments
• Excellent water quality

They reward patience with rapid growth and extraordinary coloration.

However, they often react quickly to sudden changes.

Fluctuations in alkalinity, salinity, or nutrient levels may lead to:

• Reduced polyp extension
• Tissue recession
• Loss of coloration
• Slow growth

For SPS keepers, consistency is everything.

LPS Corals: The Survivors

LPS corals are often more forgiving than SPS corals.

Many originate from deeper reef areas or more sheltered environments where water movement is less intense and nutrient availability is slightly higher.

LPS corals generally prefer:

• Moderate lighting
• Gentle to moderate flow
• Slightly higher nutrient availability
• Stable but not ultra-low nutrients
• Occasional target feeding

Because of their fleshy tissue, excessive flow can damage or irritate them.

Strong direct currents may prevent polyps from extending fully.

LPS corals often display dramatic movement and can become the visual centerpiece of a reef aquarium.

Nutrients: Different Needs, Same Principle

One of the biggest misconceptions is that all corals should be kept in ultra-low nutrient systems.

While many SPS-dominated aquariums perform well with lower nutrient levels, LPS corals often appreciate slightly richer environments.

As a general guideline:

SPS systems commonly thrive around:

NO₃: 2–10 ppm

PO₄: 0.03–0.08 ppm

LPS systems often tolerate or even benefit from:

NO₃: 5–20 ppm

PO₄: 0.05–0.15 ppm

These are not strict rules.

Every reef aquarium develops its own balance.

What matters most is stability.

Corals adapt to consistency far better than constant fluctuations.

Lighting and Flow: More Is Not Always Better

Many reef keepers assume stronger lighting and stronger flow automatically produce better results.

This is not always true.

SPS corals often enjoy higher PAR and chaotic flow patterns that help remove waste and deliver nutrients.

LPS corals, however, can become stressed under excessive intensity.

Too much flow may tear delicate tissue.

Too much light can lead to bleaching or prolonged contraction.

Observing coral behavior is just as important as reading equipment specifications.

Your corals often tell you what they need.

Feeding: Corals Eat Too

Although zooxanthellae provide energy through photosynthesis, many corals also benefit from feeding.

LPS corals often respond visibly to foods such as:

• Mysis shrimp
• Reef pellets
• Coral foods
• Fine particulate feeds

SPS corals can also utilize dissolved organic matter and fine suspended nutrients.

A reef aquarium should not be viewed as a sterile environment.

Balanced nutrition supports healthy fish, vibrant coral coloration, and long-term growth.

Building a Mixed Reef Successfully

Many hobbyists dream of maintaining a mixed reef aquarium containing both SPS and LPS corals.

This is absolutely achievable.

Success depends on understanding placement and compromise.

For example:

• SPS corals can be placed higher in the aquarium where lighting and flow are stronger.
• LPS corals can occupy lower or more protected areas with gentler conditions.
• Nutrients should remain measurable but stable.
• Maintenance routines should be consistent.

The goal is not perfection.

The goal is creating an environment where different organisms can coexist successfully.

Choosing a Reef Salt for Diverse Reef Systems

Whether you keep SPS, LPS, or a mixed reef aquarium, stability begins with a reliable foundation.

A high-quality reef salt should deliver:

• Consistent salinity
• Balanced calcium and magnesium
• Stable alkalinity
• Essential trace elements
• Reliable batch-to-batch consistency

These factors help support coral growth, fish health, and overall aquarium stability.

The Blue Treasure Philosophy

At Blue Treasure, we believe every successful reef aquarium starts with biological balance.

Blue Treasure Probiotic Reef Salt is formulated for modern reef systems and contains beneficial probiotic bacteria, prebiotic support, vitamins, amino acids, and essential marine elements designed to support both fish and coral health.

Whether your passion is the vivid coloration of SPS corals, the graceful movement of LPS corals, or the beauty of a mixed reef aquarium, stability remains the key to long-term success.

Final Thoughts

SPS corals and LPS corals are different.

They evolved in different habitats.

They respond to different environmental conditions.

But they share one fundamental requirement:

A stable ecosystem.

The more we understand the natural needs of our corals, the better we can recreate the ocean within our aquariums.

And when we stop trying to force every coral into the same conditions, our reef tanks begin to flourish.