How to Glue Coral Frags: The Complete CA Glue Guide for Reefers

Fragging corals is one of the most rewarding aspects of reef keeping, but choosing the right adhesive can make or break your success. If you've ever wondered how to glue coral frags safely and effectively, you're in the right place. This complete guide covers everything you need to know about using CA glue for coral fragging.

Why CA Glue is the Best Glue for Coral Fragging

Cyanoacrylate (CA) glue has become the gold standard in the reef keeping community for several compelling reasons:

• Instant bond: Forms a secure hold in seconds, even underwater
• Reef-safe: Once cured, it's completely inert and safe for marine life
• Versatile: Works on frag plugs, live rock, and ceramic discs
• Durable: Withstands water flow and the coral's natural growth

Trusted by the Reef2Reef community, professional-grade CA glue from Gluemasters is made in the USA specifically for demanding applications like reef keeping.

Which CA Glue Viscosity for Which Corals

Not all CA glues are created equal. The viscosity (thickness) you choose dramatically affects your fragging success.

Thick CA Glue (1500 CPS) - Best for Most Frags

Our Thick CA Glue (1500 CPS) is the workhorse of coral fragging. This viscosity:

• Stays where you put it, even on vertical surfaces
• Perfect for LPS corals like Euphyllia, Acans, and Chalices
• Ideal for SPS frags with larger surface areas
• Won't run into coral tissue and cause irritation
• Gives you time to position the frag before it sets

Ultra Thin CA Glue (05 CPS) - For Delicate Zoanthids

When working with small zoanthid polyps or tiny frags, ultra-thin CA glue penetrates tight spaces without overwhelming delicate tissue. It wicks into microscopic gaps for maximum adhesion on small attachment points.

CA Gel - For Vertical and Overhead Mounting

Mounting frags on the back wall or underside of overhangs? CA gel won't drip or run, making it perfect for these tricky placements. It's especially useful for attaching frags to vertical rock faces in display tanks.

Step-by-Step: How to Glue Coral Frags

1. Prepare Your Work Area

Pat the frag plug or rock dry with a paper towel. The dryer the surface, the better the bond. You don't need it completely dry—just remove excess water.

2. Apply the CA Glue

Place a small bead of thick CA glue on the frag plug or mounting point. For a quarter-sized frag, you only need about a rice grain's worth of glue.

3. Position the Coral

Quickly but gently press the coral's base onto the glue. Hold firmly for 5-10 seconds. You'll feel it grab.

4. Submerge Carefully

The magic of CA glue is that it cures underwater. Lower the frag into your tank at an angle to avoid trapping air bubbles. The glue will set completely within 30-60 seconds.

Underwater Curing: What You Need to Know

One of CA glue's superpowers is its ability to cure in the presence of moisture—including saltwater. When CA glue contacts water, it undergoes rapid polymerization:

• The bond actually strengthens in water
• Creates a rock-hard, permanent hold in under a minute
• No toxic fumes in your tank (curing happens via chemical reaction, not evaporation)

Some reefers worry about the white "bloom" that appears when CA glue hits water. This is normal calcium carbonate formation and is completely harmless to your reef.

Is CA Glue Safe for Marine Life?

This is the most common question new reefers ask, and the answer is a resounding yes—when used correctly.

• Once cured, CA glue is biologically inert
• It won't leach chemicals into your aquarium
• The Reef2Reef community has used it for decades without issues
• Avoid getting uncured glue directly on coral tissue (it can cause irritation)

Pro tip: Apply glue to the plug or rock, never directly to the coral. This prevents tissue damage and ensures a clean bond.

Common Coral Fragging Mistakes to Avoid

Using Too Much Glue

More isn't better. Excess glue can creep onto coral tissue or create unsightly white residue. A little goes a long way.

Not Drying the Surface

While CA glue bonds underwater, starting with a drier surface creates a stronger initial tack. Pat surfaces dry for best results.

Choosing the Wrong Viscosity

Thin glues run everywhere. Gel is overkill for horizontal surfaces. Match your viscosity to your application for best results.

Pro Tips from Experienced Reefers

• Keep glue fresh: CA glue has a shelf life. Store in a cool, dry place and replace every 6-12 months
• Work in batches: Frag multiple corals in one session to maximize efficiency
• Use accelerator sparingly: While accelerator speeds curing, it can also create heat. For corals, let water do the work
• Have extras ready: Keep extra frag plugs and CA glue on hand—you'll use more than you think

Where to Learn More

For a deeper dive into techniques and best practices, check out our comprehensive guide on CA glue for coral fragging.

Ready to Start Fragging?

Success in coral fragging starts with the right adhesive. Gluemasters Thick CA Glue is formulated for professional results, trusted by the reef keeping community, and made right here in the USA.

Free shipping on orders over $74.99! Stock up on multiple viscosities to handle any fragging situation. Shop Thick CA Glue →

Whether you're fragging your first zoanthid or running a full-scale coral propagation operation, the right CA glue makes all the difference. Happy fragging!