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Magnetic Frag Rock (Set of 2) – Magnetic Coral Frag Mounts
Natural Magnetic Frag Rock
Aragonite-based magnetic frag racks are hand-poured with a mixture of silica sand, aragonite, crushed coral, and cement to create a genuinely organic appearance using natural minerals. Each magnetic frag rack supports one standard 0.5" frag plug stem for optimal coral growth, and the surface will colonize like natural frag rock.
| Oolitic Aragonite | Coarse Aragonite | Crushed Coral | Silica Sand | Cured Cement |
Strong Glass Attachment
The reef rock frag rack is held in place by two 3 mm neodymium disc magnets that will safely connect through glass up to 0.5" thick.
Double-Coated Magnets
Each neodymium magnet begins with a durable factory-applied black epoxy coating before being permanently encapsulated in a thick layer of clear epoxy during manufacturing. This dual-layer protection completely isolates the magnet from saltwater, providing long-term corrosion resistance in reef aquariums.
Reef-Ready Upon Arrival
Every magnetic frag mount is fully cured and thoroughly soaked before packaging to stabilize water chemistry. No additional curing or soaking is required—simply rinse if desired and place it directly into your reef aquarium.
Each order contains:
(2) x 1-plug magnetic frag racks of the selected color
Frag substrates designed for coral happiness.
Reef plugs & reef discs are designed for optimal coral health from the minerals to the geometry to the cure process. Reef plugs take an average of one full month from initial mixture to aquarium-readiness to ensure your corals receive substrates that maximize encrustation.
We put extensive care into making sure that every plug & disc meets our standard of quality, knowing that every reefer has put just as much care into their own aquarium.
Natural Appearance
Too many frag substrates look like glaring white circles under the coral. Our substrates are poured to look natural and entirely unique.
Intentional Design
Every substrate design we release is reworked until it suits coral attachment perfectly while allowing you to place corals exactly where you want them.
Reef-Friendly Minerals
We use the minerals corals love in the wild to create our substrates to provide a balanced and predictable environment for your corals.
We accept returns and exchanges within specific guidelines designed to maintain the quality and biological safety of our products.
If your order arrives damaged or incorrect, please contact us within 7 days of delivery and include:
Once reviewed, we may provide:
Approved refunds may take several business days to fully process after the return is received.
Yes. Orders over $20 after discounts qualify for free shipping within the United States. Additional shipping information can be found during checkout or by contacting our support team.
Yes. Any active discounts or promotional pricing that apply to your order will automatically appear during checkout. If you have questions about current sales or promotions, feel free to contact us.
Our products are manufactured in Lee's Summit, Missouri.
Yes. All of our aragonite-based products, including magnetic frag rocks, are cured & soaked prior to packaging. All units are tested to ensure stability prior to packaging.
Yes. The substrate a coral grows on can influence encrustation, biofilm development, and overall growth patterns. Surface texture and porosity help determine how naturally a coral can attach and spread over time. Mineral-based frag substrates may also help create a more natural microenvironment around the frag, encouraging healthier attachment and more consistent growth compared to smoother or less porous materials.
Proper curing is essential before introducing any frag substrate into a reef aquarium, but the curing process varies depending on the material used. Ceramic frag plugs become reef safe after being fully kiln-fired because the material becomes chemically stable. Natural reef rock typically requires saltwater curing to remove excess organic material and stabilize water chemistry. Cement-based frag substrates require freshwater or RODI soaking with regular water changes to reduce excess alkalinity before aquarium use. Each curing process is designed to ensure the substrate is safe for marine livestock and stable in reef conditions.
Corals thrive in stable reef environments with balanced water chemistry, proper lighting, and consistent flow. Important parameters include alkalinity, calcium, magnesium, pH, nitrate, phosphate, and trace elements. Most corals also require stable lighting schedules and moderate water movement that mimics natural reef conditions. Because every species has different requirements, researching the preferred conditions for your specific coral is always recommended.
Yes. Our frag plugs and frag discs are designed to work with a wide variety of coral species, including soft corals, LPS, and SPS corals. The natural mineral blend and porous structure help support strong attachment and natural encrustation. Many hobbyists especially enjoy using these substrates for soft coral propagation because frags can often attach naturally over time with reduced reliance on adhesives. Stony corals also benefit from the textured surface, which may encourage more natural growth patterns and faster encrustation.
That depends on the type of coral and your preferred propagation method. Some soft corals can naturally attach themselves when placed in low flow conditions for several days or weeks. Many reef hobbyists still use a small amount of reef-safe cyanoacrylate gel to create an initial bond, especially for stony corals or higher flow systems. Once secured, the coral will begin naturally encrusting onto the substrate surface over time.
