Coral Dipping & Quarantine Guide — Pest Removal and Acclimation

# Introducing New Corals to Your Tank: Dipping and Quarantine Guide

When introducing new corals to your aquarium, the most critical steps are dipping (medicinal treatment) and quarantine. We understand the temptation to place your beautiful new coral directly into your main tank, but skipping these procedures risks introducing pests and pathogens that can cause irreversible damage to your entire system.

Why Dipping and Quarantine Are Essential

Corals often carry microscopic pests and parasites invisible to the naked eye. Pests that cause no problems in a shop's or breeder's tank can explode in population in a new environment. Once pests establish in your tank, complete eradication becomes extremely difficult, and in the worst case, all your corals could be wiped out.

Common coral pests include:

• Flatworms (Planaria): Leaf-shaped worms that eat coral tissue. They frequently parasitize Zoanthids and Goniopora, and mass infestations can completely cover corals
• AEFW (Acropora-Eating Flatworms): Flatworms that exclusively parasitize Acropora. They're difficult to spot because their coloring mimics the coral, and since they lay eggs on the skeleton, they're troublesome to eradicate
• Red Bugs (Tegastes acroporanus): Tiny crustaceans parasitizing between Acropora polyps. Visible as red dots, infected corals show poor polyp extension
• Sea Slugs: Sea slugs from the family Monocelididae feed on Zoanthids and coral tissue
• Nudibranchs: Snails from the genera Drupella and Coralliophila parasitize the base of Acropora and consume tissue
• Mantis Shrimp: Hide in live rock and damage corals or predate other organisms

Basic Dipping Procedure

Dipping involves soaking the coral in medicated seawater for a set duration. Follow these steps:

What you'll need: Dip medication, clean containers (2-3), thermometer, timer, tweezers, magnifying glass or loupe, air pump (optional but recommended).

Step 1 – Prepare the dip solution: Fill a clean container with tank water and dissolve the medication at the specified concentration. Match the water temperature to your tank. Temperature differences stress corals.

Step 2 – Place the coral: Gently submerge the coral in the dip solution. Add light aeration with an air pump or gently rock the container to create water flow.

Step 3 – Observe and remove pests: During dipping, examine the coral's surface with a magnifying glass. Pests respond to medication and detach, so remove them with tweezers. Check the container bottom for fallen pests.

Step 4 – Strictly follow timing: Dipping duration varies by medication. Too short is ineffective; too long damages the coral. Use a timer for precision.

Step 5 – Rinse: After dipping, rinse the coral in a separate container of clean culture water to avoid carrying dip solution into your main tank.

Common Dip Medications and Their Characteristics

Here are the most widely used coral dips:

CoralRx: One of the most popular coral dip products. Based on natural ingredients, it's effective against flatworms, nudibranchs, snails, and many other pests. Use about 15mL per 4L seawater, dipping for 5-10 minutes. Safe for both SPS and LPS, but avoid on soft corals like sea whips.

Bayer Advanced (Imidacloprid): A household insecticide ingredient that's extremely effective against red bugs and AEFW. Use about 1mL per 250mL seawater for 15-20 minutes. Highly effective on SPS, but use cautiously on LPS and soft corals. Affects crustaceans like shrimp and crabs, so rinse thoroughly to avoid introducing it to your main tank.

Revive Coral Cleaner: Iodine-based dip that removes pests and prevents bacterial infection. Its gentle formulation works well on delicate corals.

Hydrogen Peroxide: Sometimes used to remove flatworm eggs and algae. The standard method is adding small amounts of 3% hydrogen peroxide, but concentration control is difficult and not recommended for beginners.

Setting Up and Running a Quarantine Tank

Dipping alone may not completely eliminate pests. AEFW eggs, for example, are laid inside the skeleton and can't be removed in a single dip. A quarantine tank (QT) with extended observation is the most reliable way to protect your main tank.

Basic quarantine setup: A small 30-60cm tank with lighting, circulation pump, and heater is sufficient. A protein skimmer or live rock isn't essential but helps with water quality. Use the same salt mix as your main tank, matching temperature and salinity.

Recommended quarantine period: Generally 2-4 weeks. If AEFW is suspected, repeat dipping weekly for 3-4 total treatments before introducing to the main tank—this breaks the egg-hatching cycle.

Quarantine management: Observe the coral daily, documenting polyp extension and color changes. If problems appear, dip again or isolate affected specimens. Perform 1-2 weekly water changes to maintain water quality.

Identifying and Managing Pests

Here's how to identify and handle pests if discovered during dipping or quarantine:

AEFW eggs are the main concern. They appear as small brown dots attached to the base of the skeleton. Gently scrape them off with tweezers, then dip. Repeat the dipping cycle 3+ times at weekly intervals.

Flatworms are relatively easy to remove with dipping, but mass infestations indicate tissue damage. After dipping, inspect for weakened areas; if necrotic sections exist, consider fragging from healthy portions.

Nudibranchs are often nocturnal, so shining a light at night is an effective search method. Remove them with tweezers, but monitor for laid eggs.

Introducing Treated Corals to Your Main Tank

When introducing quarantine-cleared corals to your main tank, follow a careful process:

Perform a final dip and rinse in clean culture water, then acclimate by temperature and water chemistry. If parameters differ significantly between quarantine and main tanks, use the drip method over 30 minutes to 1 hour for gradual acclimation. After introduction, place the coral in a low-flow area to observe for several days before moving it to its final position.

Confident Coral Introductions with Br-Choku

With Br-Choku, you can source corals directly from breeders experienced in specimen care management. Many breeders perform dipping before shipment, offering lower-pest-risk specimens. You can consult breeders directly on introduction procedures and dipping methods, making even your first coral addition stress-free and worry-free.