How to Quarantine for Reef Keeping - Step by Step
Step-by-step guide to Quarantine for Reef Keeping. Includes time estimates, tips, and common mistakes to avoid.
Quarantine is one of the most effective ways to protect a reef tank from fish disease, coral pests, and unwanted hitchhikers. A simple, well-run quarantine process helps you observe new arrivals, intervene early, and avoid introducing problems that can take months to eliminate from a display system.
Prerequisites
- -A dedicated quarantine tank for fish, usually 10-40 gallons depending on livestock size
- -A separate coral quarantine tank or container with stable salinity, heat, and light
- -Heater and reliable thermometer, aiming for 76-78 F
- -Sponge filter or HOB filter seeded in advance, plus air pump if needed for oxygenation
- -Refractometer calibrated with 35 ppt solution, targeting 1.025-1.026 SG unless matching vendor water first
- -Ammonia alert badge and test kits for ammonia, nitrite, nitrate, pH, alkalinity, and copper if medicating fish
- -PVC elbows or couplings for fish shelter, and a bare-bottom tank for easy waste removal
- -Coral dip products such as iodine-based dip or pest-specific dip, plus separate rinse containers
- -Dedicated nets, turkey baster, frag rack, tweezers, and towels to prevent cross-contamination
- -Basic knowledge of common reef threats such as Cryptocaryon, Amyloodinium, flatworms, nudibranchs, red bugs, and vermetid snails
Set up fish and coral quarantine separately because their needs and treatment options are very different. Fish QT is typically bare-bottom with inert hiding places and no rock or sand, while coral QT should provide moderate flow, stable light, and clean surfaces for observation. Never expose corals or invertebrates to fish medications such as copper.
Tips
- +Use opaque pipe fittings in fish QT to reduce stress and aggression.
- +Keep coral QT simple with removable frag racks so you can inspect plugs and undersides easily.
Common Mistakes
- -Trying to quarantine fish and corals in the same tank.
- -Adding live rock to medicated fish QT, which can absorb copper and complicate dosing.
Pro Tips
- *Keep one extra cycled sponge filter in your sump at all times so you can launch an emergency fish QT without waiting on the biofilter.
- *When quarantining tangs, wrasses, or anthias, prioritize oxygenation with strong surface agitation because stressed active fish decline quickly in low-oxygen systems.
- *For acropora frags, inspect at night with a flashlight for flatworms or red bugs, since some pests are easier to spot when polyps are retracted.
- *Replace heavily encrusted frag plugs with clean mounts whenever possible, because eggs, vermetid snails, and nuisance algae often survive on the original base.
- *If using copper in fish QT, verify concentration after every water change and after adding equipment or media, since therapeutic levels can drift more than many hobbyists expect.
Keep a clean backup log for test day.
The Printable Reef Logbook gives you water testing, dosing, maintenance, and livestock worksheets you can print or save as a PDF.