Top 5 Water Parameters You Must Maintain for LPS Coral Success

LPS (Large Polyp Stony) corals are among the most colorful and eye-catching additions to reef tanks, but their beauty depends heavily on stable water conditions. If you’re planning to keep LPS corals like Acanthastrea, Torch, Frogspawn, or Duncan, it’s crucial to understand and maintain the right water parameters.

Here are the top five water parameters every LPS coral keeper must monitor for healthy growth and vibrant color.

1. Alkalinity (dKH)

• Ideal Range: 8.0–10.0 dKH
• Why It Matters: Alkalinity helps stabilize pH and supports coral skeletal growth. LPS corals rely on steady alkalinity for strong, structured tissue development.
• Tip: Avoid sudden swings. Test weekly and dose buffer solutions slowly when needed.

2. Calcium (Ca)

• Ideal Range: 400–450 ppm
• Why It Matters: Calcium is a primary building block for LPS coral skeletons. Without it, polyp growth slows and colors fade.
• Tip: Use a high-quality calcium supplement and test 2–3 times per week if you have fast-growing corals.

3. Magnesium (Mg)

• Ideal Range: 1250–1350 ppm
• Why It Matters: Magnesium helps maintain calcium and alkalinity levels in balance. It also prevents precipitation of calcium carbonate.
• Tip: Check magnesium monthly and adjust before making calcium or alkalinity changes.

4. Nitrate (NO3)

• Ideal Range: 5–15 ppm
• Why It Matters: LPS corals actually need some nitrates to thrive. Too little and they starve; too much and you risk algae blooms or brown-out.
• Tip: Feed your corals and fish properly. Don’t over-filter your water or chase “zero nitrate.”

5. Phosphate (PO4)

• Ideal Range: 0.03–0.10 ppm
• Why It Matters: Like nitrates, phosphates are required in small amounts. Balanced PO4 helps fuel zooxanthellae photosynthesis and coral pigmentation.
• Tip: Use GFO (granular ferric oxide) or phosphate removers cautiously to avoid sudden drops.

Bonus: Other Helpful Metrics

• Salinity: 1.025–1.026 SG
• Temperature: 76–78°F (24–26°C)
• pH: 8.0–8.3

Even if you keep your “big five” in range, supporting parameters like salinity and temperature are key to long-term success.

How CoralCavern Helps

At CoralCavern, all LPS coral frags are grown and maintained under optimal conditions:

• Routine testing of all key parameters
• Stable nutrient and trace element dosing
• Pest-free, aquacultured coral selection

We also provide recommended care sheets with every order, so you always know how to replicate our success in your own tank.

Final Thoughts

LPS corals reward consistent reefers with impressive growth, color, and movement. Focus on these five core water parameters to build a healthy, stable reef environment that lets your corals flourish.