Montipora effusa — Practical Care Profile (SPS)
Condensed guide with two photographs (macro + micro) for identifying and keeping Montipora effusa. Emphasis on stability, medium–high PAR, strong flow, and STN/RTN prevention.
Introduction
An encrusting/plating SPS coral from the family Acroporidae (Dana, 1846). Requires stable parameters, strong, random flow and medium–high PAR. Suitable for mariculture and restoration projects, with rapid growth.
Experience — “Stable > perfect: small adjustments, records, and avoiding repeated KH/temperature swings.”
Identification and Taxonomy
| Field | Details |
|---|---|
| Scientific name | Montipora effusa (Dana, 1846) |
| Family | Acroporidae |
| Type | SPS (Small Polyp Scleractinia) |
| Placement | Middle–upper area; intense light and strong/turbulent flow. |
Biotope and Setup
Slopes and crests with high exchange rates. Avoid prolonged shading; plates can accumulate detritus if flow is poor.
Water Parameters
| Parameter | Practical range | Notes |
|---|---|---|
| Temperature | 24–28 °C | Avoid >30 °C (bleaching risk). |
| Salinity | sg 1.023–1.026 | Daily stability > precision. |
| Alkalinity (KH) | 7–10 dKH | Changes < 0.5 dKH/day. |
| Calcium (Ca) | 410–460 ppm | Active calcification. |
| Magnesium (Mg) | 1220–1380 ppm | Ionic balance. |
| Nitrate (NO3) | 0.2–5 ppm | Low but measurable. |
| Phosphate (PO4) | 0.02–0.08 ppm | Avoid prolonged “0” under intense light. |
| pH | 8.0–8.3 | Minimal fluctuation. |
Worked / Did Not Work
Worked
- Automated dosing (KH/Ca/Mg) + small water changes.
- Activated carbon/ozone for clear water (less yellowing).
Did Not Work
- Abrupt adjustments on the same day.
- Continuous laminar flow (accumulation on surfaces).
Lighting (PAR and Spectrum)
| Factor | Target | Notes |
|---|---|---|
| PAR | 180–350 μmol·m−2·s−1 | Acclimation if you exceed 300–350. |
| Spectrum | Blue (~450 nm) | Photosynthesis + chromoproteins. |
| Photoperiod | 10–12 h | Gentle ramps (sunrise/sunset). |
Flow (Hydrodynamics)
Strong and random/turbulent ≫ laminar. Plates require sufficient shear to prevent deposits and promote exchange.
Feeding (Heterotrophic Support)
Mixotrophic: the main contribution comes from zooxanthellae; under stress, it benefits from nanoplankton (0.5–5 μm), amino acids, and coral foods 1–2×/week (broadcast feeding with reduced flow, skimmer switched on after 30–60 min).
Worked / Did Not Work
Worked
- Moderate doses with controlled nutrient export.
- Nighttime feeding or feeding with dimmed lights.
Did Not Work
- Chronic overfeeding → PO4/NO3 levels.
Fragmentation and Propagation
M. effusa responds well to fragmentation/microfragmentation. Maintain active flow after cutting and clean surfaces to promote healing.
Health (STN/RTN and the Microbiome)
| Condition | Signs | Actions |
|---|---|---|
| STN (slow tissue necrosis) | Progressive tissue loss | Check KH/temperature, improve flow, trim away dead tissue. |
| RTN (rapid tissue necrosis) | Acute tissue sloughing | Immediate fragging; isolation; complete stability. |
| Bleaching / dysbiosis | Discoloration, mucus | Light acclimation; low but detectable nutrients; stability. |
Scientific Evidence (2018–2025)
Water and Stability
- 24–28 °C; sg 1.023–1.026; KH 7–10; Ca 410–460; Mg 1220–1380; NO₃ 0.2–5; PO₄ 0.02–0.08; pH 8.0–8.3. Based on a synthesis of recent literature: NCBI/PMC, ScienceDirect.
Lighting
- PAR 180–350; blue ~450 nm; photoperiod 10–12 h: Frontiers in Marine Science, Nature — Coral Reefs.
Flow
- Turbulent flow > laminar; reduces deposits and improves exchange: PLOS ONE, Royal Society Open Science.
Microbiome and Health
- Microbiome stability (e.g., Endozoicomonas) correlates with less STN/RTN: PMC — coral microbiome.
Fragmentation / Mariculture
Recommended Reading
More information at Pasionreef and AtlasReef.
Getting started with SPS corals? Also explore SPS Corals and Marine Aquarium Bioindicators.
Conclusion
With two photos and a clear structure, M. effusa is well documented: prioritize stability, random flow, and gradual adjustments.
Images: AtlasReef Media Library (original/AI-generated, royalty-free). · Guide written by AtlasReef.