Why quarantine matters for LPS corals
Quarantine is one of the most valuable habits a reef keeper can build, especially when working with lps corals. Large Polyp Stony corals often arrive stressed from collection, shipping, and handling, and their fleshy tissue can hide pests, bacterial issues, and early tissue damage that are easy to miss in a busy display tank. A dedicated quarantine process gives you time to inspect, stabilize, and treat new additions before they ever touch your main system.
LPS corals also tend to be expensive, slow-growing, and highly visible centerpiece animals. A single infected frag plug or unnoticed pest can create weeks of problems in a display packed with Euphyllia, Acanthastrea, Favia, Micromussa, Lobophyllia, Blastomussa, Duncanopsammia, and similar corals. Quarantine reduces the risk of brown jelly disease, flatworms, vermetid snails, nuisance algae, bacterial infections, and sudden parameter shock.
Just as importantly, quarantine gives you a controlled environment where you can match salinity, temperature, and light more gradually. For many hobbyists, using a tracking tool like My Reef Log makes it much easier to compare incoming coral conditions to the quarantine tank and spot trends before they become losses.
Quarantine schedule for LPS corals tanks
For most new lps corals, a quarantine period of 21 to 45 days is a practical target. Shorter than 2 weeks often does not allow enough time to observe tissue recession, pest eggs, or feeding response. Longer than 6 weeks can be useful for high-value colonies or corals that arrive in poor condition.
Recommended timeline
- Day 0 - Inspect, dip, rinse, and place in quarantine
- Days 1-7 - Focus on stability, low stress, and daily visual checks
- Days 7-21 - Watch for pests, recession, brown jelly, and feeding response
- Days 21-30 - If fully extended, stable, and pest-free, begin preparing for transfer
- Days 30-45 - Extended observation for sensitive or previously stressed pieces
A good quarantine tank for LPS should stay close to your display in key parameters:
- Temperature - 76 to 78.5 F
- Salinity - 1.025 to 1.026 SG
- Alkalinity - 8.0 to 9.0 dKH
- Calcium - 400 to 450 ppm
- Magnesium - 1250 to 1400 ppm
- Nitrate - 5 to 15 ppm
- Phosphate - 0.03 to 0.10 ppm
- Ammonia - 0 ppm
- Nitrite - 0 ppm
Ammonia and nitrite should always remain undetectable in quarantine. If you need a refresher on safe ranges, see Ammonia Levels for LPS Corals | Myreeflog and Nitrite Levels for LPS Corals | Myreeflog.
Special considerations for quarantining LPS corals
LPS corals are not all identical, but many share traits that change how quarantine should be handled. Their fleshy polyps can tear against skeleton edges, they are sensitive to abrupt light changes, and many inflate dramatically when healthy. That means a quarantine setup for SPS frags is often too bright, too turbulent, or too sterile for newly imported LPS.
Light acclimation matters more than many hobbyists expect
Most lps corals do best in moderate light during quarantine. A starting range of 50 to 100 PAR is safe for many fleshy species, with some moving up to 80 to 150 PAR after they settle. Starting too bright can trigger bleaching, excessive contraction, or tissue recession, particularly in acans, scolys, blastos, and lobos.
Flow should be gentle to moderate
Aim for indirect, varied flow. The coral should move slightly, but not whip around or keep its skeleton exposed. Euphyllia can tolerate a bit more motion than fleshy brain corals, but blasting any LPS with direct powerhead output in quarantine is a common mistake.
Feeding can help recovery, but only if water quality stays stable
Many LPS benefit from target feeding 1 to 2 times per week once they are settled. Small portions of mysis, finely chopped seafood, reef roids, or specialized coral foods can improve expansion and recovery. If the quarantine tank is small, overfeeding can spike nutrients quickly, so test often and siphon leftovers.
Dips are useful, but not a substitute for observation
Coral dips can remove many hitchhikers, but they do not guarantee a pest-free coral. Eggs, hidden tissue infections, and stubborn pests may still emerge days later. Quarantine is what catches what dipping misses.
When comparing incoming and stable conditions, many reefers use My Reef Log to monitor salinity and nutrient consistency over the full quarantine window. That is particularly useful with lps-corals, because they often react to drift before test kits show a dramatic problem.
Step-by-step quarantine guide for LPS corals
1. Prepare the quarantine tank before the coral arrives
Set up a simple, stable system with a heater, gentle flow, biological filtration, and moderate lighting. Bare bottom is easiest to clean. Use frag racks or small inert platforms to keep corals off the glass and allow inspection from multiple angles.
Before arrival, verify:
- Temperature is stable within 0.5 F
- Salinity is 1.025 to 1.026 SG, or matched to the display if you keep slightly different levels
- Alkalinity is within 0.5 dKH of the display
- Ammonia and nitrite are 0 ppm
Salinity mismatch is one of the easiest ways to stress new arrivals, so it helps to review Salinity Levels for LPS Corals | Myreeflog when dialing in your quarantine system.
2. Inspect the coral closely on arrival
Look at the flesh line where tissue meets skeleton. Healthy LPS usually have full tissue coverage, even inflation, and no foul odor. Check frag plugs and undersides for vermetid snails, algae, flatworms, nudibranchs, and egg clusters. If the plug is questionable, many experienced reef keepers remove the coral from the original plug and remount it.
3. Dip the coral appropriately
Use a reputable coral dip and follow the manufacturer's directions exactly. Most dips run for 5 to 15 minutes, depending on product and species tolerance. Use clean saltwater for rinsing before the coral enters quarantine. Avoid stacking multiple harsh treatments on a fresh, stressed coral unless there is a clear reason.
4. Acclimate with stability, not endless drip time
Temperature acclimate first, then compare salinity. If the source water is close, a short acclimation is usually enough. Long drip acclimation in dirty bag water can do more harm than good. For many LPS shipments, the key is to get the coral into clean, oxygenated water quickly after inspection and dipping.
5. Start low with light and moderate with flow
Place new lps corals in lower light and indirect flow for the first several days. If they expand well and show no paling, you can gradually increase placement or intensity. Increase PAR slowly over 5 to 10 days, not all at once.
6. Observe daily and test regularly
During the first week, inspect the coral every day for recession, slime, discoloration, or unusual contraction. Test salinity, temperature, and alkalinity frequently. In a small quarantine tank, nutrients can swing fast, so check nitrate and phosphate at least weekly, and more often if you are feeding heavily.
7. Feed only after the coral settles
If feeding tentacles appear and tissue is inflated, offer a small meaty meal or fine particulate food. Turn off pumps briefly and watch for capture. A healthy feeding response is a strong positive sign in many acans, duncans, blastos, and favias.
8. Treat problems early
If you see brown jelly, rapid tissue loss, or obvious pest activity, isolate the affected coral immediately. Increase inspection frequency and consider a follow-up dip or targeted treatment based on the issue. Siphoning away jelly-like material right away can sometimes prevent spread to nearby pieces.
9. Transfer only after consistent stability
Do not move the coral to the display just because it looks better for one day. Wait until it has shown at least 2 to 3 weeks of stable tissue, normal extension, no visible pests, and predictable feeding or inflation behavior.
What to watch for during LPS coral quarantine
Signs the coral is responding well
- Polyp inflation increases over several days
- Tissue covers the skeleton fully and evenly
- Color remains stable or improves
- Feeding tentacles appear, especially in the evening
- New heads or rim growth appear on settled frags
- No excess mucus, no brown film, no odor
Signs the coral is responding poorly
- Tissue recession exposing white skeleton
- Persistent deflation for several days
- Brown jelly or cloudy mucus
- Bleaching under moderate PAR
- Sharp skeleton edges cutting into tissue during inflation
- Lack of feeding response after initial recovery period
For many LPS species, slow decline is more common than sudden collapse. That is why trend tracking matters. Logging alkalinity, salinity, nitrate, and phosphate in My Reef Log can reveal subtle instability that lines up with contraction or recession.
Common mistakes when performing quarantine in LPS corals tanks
Using a sterile, unstable setup
A brand new quarantine tank with no biological filtration is risky. Even one feeding can create ammonia in a small volume. Seed your filtration ahead of time and confirm 0 ppm ammonia before adding corals.
Too much light too soon
Many imported LPS are already light-stressed. Starting at 150 to 250 PAR can bleach or irritate them. Begin lower and adjust upward only after visible recovery.
Overdipping or using harsh treatments by default
Repeated aggressive dips can strip tissue and worsen shipping damage. Treat based on what you see, not out of panic.
Ignoring alkalinity drift
Even in a coral-only quarantine system, alkalinity can change more than expected. A swing from 8.5 to 7.2 dKH in a week can be enough to trigger recession in sensitive pieces.
Placing aggressive LPS too close together
Remember that sweepers still matter in quarantine. Galaxea, favias, and some Euphyllia can sting neighbors, especially at night. Leave enough spacing to prevent hidden damage.
Feeding too heavily in a small tank
LPS enjoy food, but quarantine water volume is usually limited. Feed sparingly, remove leftovers, and avoid chasing polyp extension with excess food.
If a coral settles well in quarantine and later needs to be divided or remounted, this guide on Top Coral Fragging Ideas for Beginner Reefers is a helpful next step.
Building a repeatable quarantine routine
The best quarantine system is not the fanciest one. It is the one you can run consistently every time a new coral arrives. For lps corals, that usually means moderate light, stable chemistry, careful inspection, and enough patience to let problems declare themselves before transfer. The reward is fewer pests, better survival, and smoother adaptation to the display.
A simple checklist, regular photos, and a clear testing schedule go a long way. Many reef keepers find that My Reef Log makes this process easier by keeping parameter history, livestock notes, and task reminders together in one place. Good quarantine is not just a one-time coral task, it is a repeatable system that protects every future addition.
Frequently asked questions
How long should I quarantine LPS corals before adding them to my display?
Aim for 21 to 45 days. Three weeks is a practical minimum for healthy frags, while 4 to 6 weeks is safer for wild colonies, stressed shipments, or corals that showed pests or tissue damage on arrival.
What PAR should I use in an LPS coral quarantine tank?
Start most LPS at 50 to 100 PAR. After they settle and expand consistently, many can be moved gradually into the 80 to 150 PAR range depending on species. Avoid sudden jumps in intensity.
Should I feed LPS corals during quarantine?
Yes, but only lightly once they are stable. Feed 1 to 2 times per week with small meaty foods or quality coral foods, and remove leftovers. Feeding too soon or too heavily can degrade water quality fast.
Can I skip quarantine if I dip the coral first?
No. Dips help reduce pests, but they do not reliably remove eggs, hidden infections, or every hitchhiker. Quarantine is still the best way to observe the coral over time and prevent problems from entering your display.