Introduction
SPS corals are the showpieces that many reef keepers aspire to, known for intricate branching growth, vivid pigmentation, and fast calcification when conditions are stable. Popular genera include Acropora (millepora, tenuis, valida), Montipora (digitata, capricornis, setosa), Stylophora, Seriatopora (birdsnest), and Pocillopora. While SPS are less forgiving than soft corals and many LPS, they reward careful husbandry with exceptional color and structure.
This coral guide focuses on dialing in the fundamentals for SPS corals in reef tanks. You will find specific parameter ranges, lighting and flow targets, feeding strategies, placement insights, and solutions to common problems. If you have been searching for sps-corals best practices, this coral guide brings science and practical experience together to help you achieve stable growth and coloration.
Tracking stability is half the battle with SPS. Using My Reef Log to record water tests, visualize trends, and schedule maintenance helps you catch small drifts before they become big setbacks.
Ideal Water Parameters for SPS Corals
Consistency matters more than perfection. Aim for the following ranges, and keep daily swings minimal.
- Temperature: 76-78 F (24.5-25.5 C), daily swing under 1 F
- Salinity: SG 1.025-1.026 (35 ppt), verify with a calibrated refractometer
- pH: 8.1-8.4, avoid rapid changes over 0.2 per day
- Alkalinity: 7.5-8.5 dKH, target 8.0 dKH for balanced growth
- Calcium: 420-460 ppm, steady consumption often rises as colonies grow
- Magnesium: 1320-1400 ppm, supports ionic balance and prevents calcium carbonate precipitation
- Nitrate: 2-10 ppm, many SPS color best around 2-5 ppm
- Phosphate: 0.02-0.08 ppm, stable low phosphate supports color while avoiding starvation
As your tank becomes SPS dominant, expect alkalinity consumption of 0.2-0.4 dKH per day, sometimes more. Matching daily dosing to consumption prevents the sawtooth pattern that can trigger slow tissue loss. Pair your testing routine with simple logs in My Reef Log so you can see trends and adjust dosing proactively.
For deeper reading on core elements, see Calcium in Reef Tanks: Complete Guide | Myreeflog and Magnesium in Reef Tanks: Complete Guide | Myreeflog. Nutrient stability is equally important, especially for color and tip health, so review Nitrate in Reef Tanks: Complete Guide | Myreeflog as you tune export and feeding.
Lighting Requirements
SPS corals thrive under strong, blue-heavy lighting that provides consistent PAR and spectrum. Modern LED fixtures are popular, but T5 and hybrid setups remain excellent for even coverage.
PAR Targets
- Acropora: 250-400 PAR at upper third of the tank
- Stylophora, Seriatopora, Pocillopora: 200-300 PAR mid to upper areas
- Montipora plating and digitata: 150-250 PAR mid areas, some species tolerate higher
Spectrum and Photoperiod
- Spectrum: heavy blue channel emphasis, strong output between 420-470 nm, overall look similar to 14-20K
- Photoperiod: 9-12 hours total, 7-9 hours of peak intensity
Acclimation Tips
- Start new SPS at 50-60 percent of target PAR, increase intensity 10-15 percent per week
- Use diffuser or raise the light to smooth hotspots
- Monitor polyp extension and coloration during ramping, pale tissue indicates too much light or too little nutrients
Regular PAR checks help you understand the real intensity at each placement. If you change lenses or add new fixtures, retest and adjust rather than guessing. Logging changes and observations in My Reef Log connects cause and effect across weeks and months.
Flow Requirements
SPS corals need strong, random flow that keeps surfaces clean, delivers nutrients, and removes waste. Laminar streams aimed directly at colonies can cause tissue recession on the blast side, while dead spots encourage detritus accumulation and pests.
- Total turnover: 30-50x display volume per hour, higher in dense SPS reefs
- Pattern: alternating, gyre, or multiple cross-flow sources to produce turbulent, chaotic movement
- Placement: upper to mid areas for branching SPS, open zones with unobstructed flow
- Montipora plates: avoid trapping flow under ledges, consider side or upward angles
Schedule daily pulse and random modes so flow is not static. Switch patterns at night to reduce stress while maintaining gas exchange.
Feeding
SPS corals primarily rely on photosynthesis through their zooxanthellae, but they benefit from balanced dissolved nutrients and occasional particulate foods. Target feeding is not always necessary if your tank carries adequate nutrients and microfauna.
- Particulate foods: rotifers, oyster eggs, marine snow, fine powdered blends
- Amino acids: low dose, 1-3 times per week, watch for film algae or bacterial blooms
- Timing: after lights dim or during reduced flow periods to increase capture
- Technique: short pulses on pumps, never fully shut off oxygenating flow for long
When nutrients test near the low end, gentle increases in feeding and fish stocking can help color deepen. Avoid pushing nitrate over 10 ppm or phosphate above 0.1 ppm, especially in young systems.
Placement and Compatibility
Plan the aquascape with future growth in mind. SPS frags become colonies, which become thickets that shade neighbors.
- Upper third: Acropora, Stylophora, birdsnest (Seriatopora)
- Mid areas: Pocillopora, many Montipora digitata
- Lower to mid shelf edges: Montipora capricornis plates
Most SPS have relatively short sweeper tentacles, but they still wage chemical warfare. Keep 2-4 inches between colonies, more for fast growers. Avoid placing aggressive LPS with long sweepers near SPS. Compatible fish include peaceful communities, wrasses that help control pests, and reef-safe blennies and gobies. Use caution with angels and certain butterflyfish that may nip polyps.
Common Issues and Solutions
Bleaching or Fading Color
- Cause: light intensity too high, sudden spectrum change, or nutrient starvation
- Solution: reduce PAR by 15-25 percent, increase nitrate to 2-5 ppm and phosphate to 0.03-0.06 ppm, extend acclimation ramp
Burnt Tips and Slow Tissue Necrosis (STN)
- Cause: high alkalinity with ultra low nutrients, rapid alkalinity swings, or imbalanced dosing
- Solution: target 7.5-8.5 dKH, raise nutrients into the recommended ranges, verify dosing accuracy and daily consumption
Rapid Tissue Necrosis (RTN)
- Cause: severe stress, temperature spikes, major parameter shock
- Solution: stabilize environment, trim affected areas to clean tissue, increase flow around the colony, confirm temperature control. Review Temperature in Reef Tanks: Complete Guide | Myreeflog for prevention strategies.
Pests
- Acropora eating flatworms (AEFW), red bugs (Tegastes), Montipora eating nudibranchs
- Prevention: quarantine new frags for 4-6 weeks, weekly inspections under white light
- Treatment: targeted dips using coral-safe products, increased wrasse presence for biological pressure, manual removal of eggs on Montipora
Precipitation and Imbalance
- Cause: low magnesium or overdosed calcium/alkalinity
- Solution: maintain magnesium 1320-1400 ppm, verify dosing lines for kinks, test and correct one parameter at a time
Tips for Success
- Prioritize stability: small daily corrections beat large reactive changes
- Test schedule: alkalinity daily or every other day on growth systems, calcium and magnesium 1-2 times per week, nutrients 1-2 times per week
- Dosing strategy: match 2-part or a calcium reactor to actual consumption, consider kalkwasser for pH support if evaporation allows
- pH management: aim for 8.1-8.4 with good gas exchange, skim efficiently, and run outside air to the skimmer if indoor CO2 is high
- Mechanical and biological filtration: strong skimming, refugium or turf scrubber for steady nutrient export, consider moderate GFO only when phosphate trends upward
- Water source: RO/DI with TDS under 5, change DI resin at breakthrough
- Observation: polyp extension, growth tips, and color shifts often show changes before test kits do
- ICP testing: quarterly or semiannual checks to catch trace element imbalances and contaminants
- Quarantine: every SPS frag gets a dip, inspection, and observation period to protect the display
- Documentation: note frag origins, light and flow placement, and dosing changes. My Reef Log makes this routine, and it turns your observations into actionable trends.
Conclusion
SPS corals respond to consistent parameters, strong light and flow, and clean, nutrient-balanced water. When you keep swings small and match dosing to consumption, you can push growth and color without sacrificing stability. Use reliable testing, deliberate acclimation, and disciplined nutrient control to let your Acropora, Montipora, and related species flourish.
From frag to colony, small decisions compound over time. Plan your aquascape, protect against pests, and document changes. With My Reef Log helping you track tests, visualize trends, and automate reminders, you will spend more time enjoying a thriving SPS reef and less time chasing problems.
FAQ
What PAR should I target for Acropora at the top of the tank?
Most Acropora thrive between 250-400 PAR at the upper third of the tank. Start at the lower end and ramp 10-15 percent per week while monitoring polyp extension and color.
How do I stop burnt tips on SPS corals?
Keep alkalinity 7.5-8.5 dKH, avoid rapid changes, and maintain nitrate 2-5 ppm with phosphate 0.03-0.06 ppm. Reduce light slightly if tips are stark white, verify dosing matches daily consumption, and log results in My Reef Log for trend clarity.
Can I mix SPS with LPS corals?
Yes, but maintain space. Place SPS in higher light and flow zones, and keep aggressive LPS with long sweepers away. Chemical interactions can be subtle, so watch for signs of stress and provide 2-4 inches of clearance.
Is a calcium reactor better than 2-part dosing for SPS?
Both work. A calcium reactor excels on high-demand systems by delivering continuous alkalinity and calcium with minimal daily maintenance. Two-part is simpler to start and very effective when consumption is moderate. Choose based on demand, budget, and comfort, and monitor with consistent testing.
How often should I feed SPS?
Two to three light feedings per week with fine foods and amino acids are usually enough, provided nitrate stays under 10 ppm and phosphate under 0.08 ppm. Increase or decrease frequency based on nutrient trends and coral response, and record changes so you can correlate outcomes with adjustments in My Reef Log.