Bringing home a new fish or coral is exciting—until you realize one hitchhiker can turn into weeks of algae battles, pest removal, or a sick fish in your display. This beginner-friendly 14-day reef quarantine protocol gives you a practical routine to reduce risk with separation, observation, and simple coral dipping—without turning quarantine into a second full-time hobby.
Safety note: This guide focuses on observation-first quarantine and pest prevention. It is not a substitute for diagnosis or veterinary guidance. Avoid “random treatments” in quarantine—many medications can be harmful if misused, and most are not safe for corals/invertebrates.
Why quarantine matters in a reef tank (beginner overview)
Quarantine is your buffer zone. It helps you spot problems early, keep your display stable, and avoid introducing pests you’ll be fighting for months.
What quarantine prevents (and what it doesn’t)
Quarantine reduces risk, but it doesn’t guarantee perfection.
Fish risks you can reduce with separation + observation
- Ich/Cryptocaryon (“saltwater ich”): white spots, flashing, increased breathing
- Velvet (Amyloodinium): fast breathing, lethargy, dust-like appearance (often progresses quickly)
- Brooklynella: heavy slime coat, rapid decline (especially clownfish)
Coral/invert risks you can reduce with inspection + dipping
- Flatworms (including planaria)
- Nudibranchs (often coral-specific)
- Red bugs (on Acropora)
- Aiptasia
- Algae hitchhikers (bubble algae, turf algae)
- Egg clusters on plugs and undersides of frags (dips often don’t kill eggs)
What quarantine won’t fully prevent
- Problems that are already advanced at purchase
- Misidentification (treating the wrong issue)
- Some parasites/pests that require longer observation or targeted treatment
- Stress-related issues caused by poor water quality (especially ammonia)
The “two pipelines” idea
A simple rule that saves reef tanks:
- Fish QT ≠ Coral QT
- Fish quarantine may involve medications that are toxic to inverts
- Coral quarantine should be reef-safe and observation-based, with dips and manual removal
- Each QT needs its own tools to avoid cross-contamination
What you need for a simple reef quarantine setup
You don’t need a fancy system. You need a controllable, easy-to-clean environment.
Fish QT essentials (bare-bottom, easy to clean)
Recommended tank size guidelines
- Small fish: 10–20 gallons (38–76 L)
- Medium fish: 20–40 gallons (76–151 L)
- Bigger fish need more space or a larger temporary holding solution
Core equipment
- Heater + thermometer (aim 25–26°C / 77–79°F)
- Sponge filter or hang-on-back filter (easy to clean)
- Air pump (helps with oxygen and filter performance)
- Lid (many marine fish jump—this is non-negotiable)
- PVC elbows/couplers for hiding spots (no rock/sand needed)
Lighting
- Minimal light is fine. Bright light can increase stress in new fish.
Coral/invert QT essentials (reef-safe observation)
Core equipment
- Small tank (often 5–20 gallons / 19–76 L depending on coral count)
- Heater + thermometer (25–26°C / 77–79°F)
- Small powerhead for flow (stable, not blasting tissue)
- Simple reef light (enough for your coral type; you can start conservative and ramp up)
- Frag rack (keeps corals visible and easy to inspect)
Avoid cross-contamination
- No sand or rock from your display.
- Don’t “seed” coral QT with display rubble. It defeats the purpose.
Water quality tools that prevent most QT failures
Most quarantine failures aren’t mysterious—they’re water quality.
Keep these on hand:
- Ammonia alert badge and/or test kit (ammonia is the #1 QT killer)
- Nitrite test (useful context, but ammonia is the immediate danger)
- Refractometer (calibrated) for salinity
- Thermometer (don’t guess)
- Pre-mixed saltwater for emergency water changes
Parameter targets (practical ranges)
- Temperature: 25–26°C (77–79°F)
- Salinity: 34–35 ppt (specific gravity ~1.025–1.026 at 25°C)
- Ammonia (NH3/NH4+): 0 mg/L target; take action if detectable
- For coral QT stability (if testing):
- Alkalinity: 7–9 dKH
- Calcium: 400–450 mg/L
- Magnesium: 1250–1400 mg/L
Safety note: Many ammonia detoxifiers can interfere with some test kits. If you use one, read the label and test method carefully.
Biosecurity basics
This is what actually stops “pest teleportation” into your display:
- Dedicated nets, tweezers, baster, towels, buckets for QT
- Wash hands between tanks (and remember: wet hands = contamination)
- Never share water, even “just a little,” between QT and display
- Label tools: “FISH QT” and “CORAL QT”
The 14-day protocol at a glance (calendar format)
This schedule is built for beginners who want a repeatable routine.
Quick rules before Day 1
- Never share water between QT and display.
- Observe appetite and behavior daily.
- Keep temperature and salinity stable (stability beats perfection).
- If you see a concerning sign, pause transfers and consider extending QT.
14-day quarantine calendar (quick view)
| Day | Fish QT focus | Coral QT focus |
|---|---|---|
| 0–1 | Acclimate, settle, minimal feeding | Inspect, dip, rinse, mount/frag-rack |
| 2–3 | Watch breathing, spots, appetite; control ammonia | Monitor polyp extension; look for pests/eggs |
| 4–6 | Stabilize routine; water change if ammonia rises | Follow-up checks; consider re-dip window |
| 7–10 | Midpoint health scoring; extend if symptoms | Second inspection + preventive re-dip |
| 11–14 | “Ready for display” criteria; plan transfer | Final pest checks; transfer without QT water |
Days 0–1 — Arrival, acclimation, and first inspection
Fish: acclimation and settling
A calm Day 0 prevents a lot of problems later.
Simple acclimation steps
- Float bag to equalize temperature: 10–15 minutes
- Open bag and match salinity gradually (especially if store salinity is low)
- Aim to keep temperature 25–26°C (77–79°F) and salinity steady in QT (34–35 ppt)
- Dim lights for the first day
- Offer a small meal after the fish is calm (don’t overfeed)
Early stress-reduction checklist
- Provide PVC hiding spots immediately
- Keep the QT area quiet
- Use a lid (jumpers often jump on Day 1)
Corals: initial inspection
Coral quarantine is mostly about seeing what you bought.
Before dipping
- Inspect under white light if possible
- Look for:
- Egg clusters on the underside/plug
- Bite marks, tissue recession
- Tiny moving dots (pods are common; pests vary)
- Aiptasia on plugs or rubble
Remove plugs (when possible)
- If safe for the coral, removing the frag plug can eliminate many eggs and hitchhikers.
- If you can’t remove it, at least scrape and inspect the plug edges and underside.
First actions that lower parasite/pest load
Coral dip (product-agnostic workflow)
- Prepare 2–3 containers with QT water: dip, then rinse 1, rinse 2
- Dip according to the product’s instructions (time/dose varies)
- Use a turkey baster to gently blast tissue and crevices (dislodges pests)
- Rinse thoroughly before placing in coral QT
Physical removal
- Scrape suspicious algae
- Remove visible aiptasia (don’t “pop” it in the water if you can avoid it)
- If you find eggs, remove them manually when possible
Safety note: Dips can stress corals. Never exceed label instructions, and keep temperature/salinity matched in dip containers.
Days 2–6 — Stabilize water and watch for early signs
Daily checklist (5 minutes)
Fish
- Breathing rate (rapid breathing is a major red flag)
- Spots, dusting, excess slime
- Flashing/scratching
- Clamped fins, hiding constantly
- Appetite (eating is a great sign—sudden refusal matters)
Corals
- Polyp extension (compare to Day 1)
- Tissue recession or “burnt” edges
- Bite marks or pale patches
- “Dust” pests on tissue or base
- New aiptasia/algae growth on plug/base
Ammonia control in quarantine (the #1 beginner issue)
Quarantine tanks often aren’t fully cycled. Your goal is to prevent spikes, not “ride them out.”
Feeding strategy
- Feed small portions once or twice daily
- Remove uneaten food after a few minutes
- Underfeed slightly in the first 48 hours if ammonia is a risk
Water change triggers (practical)
- If ammonia is detectable on a reliable test, do a water change.
- Keep pre-mixed saltwater at 34–35 ppt and 25–26°C.
Seeded media—use safely
- A pre-seeded sponge filter can help a lot.
- Don’t move media back and forth between QT and display once QT is running.
Coral pest follow-up
- Re-check undersides and frag rack daily at first
- If you see pests, isolate that frag (separate container or section)
- Re-dips are commonly done in a Day 7–10 window, but follow your dip’s guidance and your coral’s tolerance
Days 7–10 — Midpoint evaluation and second-round prevention
Fish: health check and behavior scoring
At midpoint, you’re looking for consistency.
Healthy signs
- Eats aggressively and consistently
- Normal swimming posture
- Clear eyes and skin
- Normal respiration at rest
- No flashing for several days
If anything is “almost better,” that’s often a reason to extend quarantine, not end it.
Corals: second inspection + preventive re-dip
This is where you catch what the first dip didn’t:
- Newly hatched pests
- Eggs you missed
- Hidden hitchhikers that move once settled
Focus areas
- Underside of coral and base
- Plug holes and seams
- Around encrusting edges
What to do if you see a problem
Extend quarantine if:
- Fish show spots, dusting, heavy breathing, flashing, or worsening appetite
- Corals show repeated pest sightings, new egg clusters, or ongoing tissue loss
Stop and seek a diagnosis (avoid random treatments) if:
- Fish are breathing rapidly or declining quickly
- You suspect velvet or brooklynella (these can progress fast)
- You’re considering medication—confirm compatibility and correct use first
Safety note: Never medicate a coral/invert QT like a fish QT. Many fish medications are harmful to invertebrates and can contaminate equipment.
Days 11–14 — Final checks and transfer plan
“Ready for display” criteria for fish
A fish is typically ready when all are true for several days:
- Stable behavior and normal swimming
- Clear skin and fins (no spots, dusting, or lesions)
- Normal respiration at rest
- Consistent feeding response
If you had any symptoms during the 14 days, consider restarting the clock from the last day of symptoms.
“Ready for display” criteria for corals
A coral is typically ready when:
- No pests seen after repeat inspections
- No new egg clusters observed
- Good polyp extension (relative to that coral type)
- Stable color and no progressing tissue loss
Safe transfer day (avoid re-contaminating the display)
Golden rule: avoid transferring QT water
- For fish: move fish with a container or net, minimizing QT water transfer
- For corals: use a dip-and-rinse workflow one last time if appropriate
Coral transfer workflow
- Optional final dip (if coral tolerates and you have a reason)
- Rinse in clean saltwater
- Place into display
- Clean tools; allow them to dry fully before next use
Common beginner mistakes (and easy fixes)
Mixing fish and corals in one QT
Fix: Run two pipelines. Fish QT and coral QT have different risks and tools.
Skipping the lid (jumpers)
Fix: Use a tight-fitting lid or mesh top from Day 0.
Overfeeding and ammonia spikes
Fix: Feed less, test ammonia, and keep pre-mixed saltwater ready.
Assuming “reef-safe” products replace quarantine
Fix: Treat products as helpers, not substitutes. Quarantine is about time + observation.
Rushing the timeline when something looks “almost fine”
Fix: If there were symptoms, extend QT until you have a clean, stable stretch.
Tracking your quarantine in Reef Buddy (simple log template)
Consistency is easier when you log the same items every day—especially in quarantine, where small changes matter.
What to log daily
- Temperature (°C/°F)
- Salinity (ppt)
- Ammonia (mg/L)
- Feeding (what + how much)
- Symptoms/observations (fish and corals)
- Actions taken (water change %, dip performed, tool cleaning)
Example 14-day checklist you can copy
- Temp: ___ °F (___ °C)
- Salinity: ___ ppt
- Ammonia: ___ mg/L
- Fish: eating? Y/N • breathing normal? Y/N • spots/flashing? notes: ___
- Corals: PE normal? Y/N • pests/eggs seen? Y/N • notes: ___
- Actions: water change ___% • dip/rinse? ___ • cleaned tools? Y/N
When your data says “extend QT”
Extend quarantine if you log any of the following:
- Any day with detectable ammonia plus fish stress signs (gasping, lethargy)
- Any new fish symptoms (spots, dusting, flashing, rapid breathing)
- Any coral pest sighting or egg cluster discovery
- Any unexplained coral tissue loss that continues for >24–48 hours
Reef Buddy makes this easier by keeping your QT readings, notes, and “last symptom date” in one place—so you don’t have to rely on memory.
FAQ + next steps
How long should you quarantine new saltwater fish for a reef tank?
A practical minimum is 14 days for observation, but many reef keepers quarantine fish longer when parasite risk is high. If symptoms appear, extend quarantine until you’ve had multiple symptom-free days.
Can coral dips remove all pests and parasites?
No. Dips can remove many mobile pests, but they often don’t kill eggs, and some pests hide well. That’s why repeat inspections (and often a second dip) matter.
Do I need a separate quarantine tank for corals and fish?
Yes, it’s strongly recommended. Fish QT and coral QT have different needs and different “safe” products. Separate tanks and separate tools reduce cross-contamination.
What is the easiest reef quarantine tank setup for beginners?
A bare-bottom fish QT with a heater, sponge filter, lid, and PVC is the simplest. For corals, a small tank with a heater, powerhead, simple light, and frag rack works well.
How do you control ammonia in a quarantine tank without a cycled filter?
Use light feeding, test ammonia daily, and do water changes as needed. Having pre-mixed saltwater ready at 34–35 ppt and 25–26°C (77–79°F) prevents most emergencies.
Should you remove coral plugs before putting corals in quarantine?
When possible, yes. Plugs often carry eggs, algae, and aiptasia. If you can’t remove the plug, inspect and clean it thoroughly and keep the coral easy to view on a frag rack.
CTA: Make your 14 days consistent (and less stressful)
If you want this 14-day reef quarantine protocol to feel simple, not overwhelming, track it like a checklist. In Reef Buddy, you can log temperature, salinity (ppt), ammonia (mg/L), feeding, symptoms, and dip dates in seconds—so you know exactly when a fish or coral is truly “ready for display.”
If you get stuck, ask Shrimpy inside Reef Buddy for help turning your notes into a clear next step (like when to do a water change, when to re-inspect, or when to extend quarantine).