Mounting Corals: Gel, Epoxy and Stable Supports
A new coral needs a secure position, but its mounting method should not create another problem. Before choosing gel or epoxy, identify what you can actually attach. A frag plug and the expanded tissue of an Acanthophyllia need very different handling.
Choose the position before making it permanent
Try the intended position using the existing plug or a suitable support. Will the coral fit when expanded? Could it tip onto a neighbour? Is there room for growth and maintenance? Mounting should secure a considered choice rather than lock an unsuitable placement in place. For a recent arrival, include acclimation after shipping in your plan.
Gel or epoxy: What needs securing?
- A small frag on a mount: Coral adhesive gel secures a small contact point on a plug or rock. Hold the pieces still until the connection can carry the weight. First check that the exact product suits saltwater and any intended underwater application.
- An uneven joint or a larger support: Suitable epoxy putty provides a mouldable connection. It is initially soft, so a heavy or overhanging piece needs support while it sets.
- A large, fleshy single polyp: A stable resting position comes first. Adhesive on living tissue cannot make an unsuitable location safe.
Compare products in our coral adhesive collection by their intended use. An aquarium label alone is not enough: does it specify saltwater, underwater application and a suitable curing procedure? A freshwater product should not be treated as reef-compatible without the relevant manufacturer approval.
Keep living tissue away from the joint
Where practical, secure the existing plug or rock. Identify the contact area before opening the adhesive. Do not push a polyp into putty or spread gel across living tissue to obtain a stronger hold. Cutting or breaking the coral is not necessary for ordinary positioning.
Trachyphyllia, Acanthophyllia and Cynarina can expand soft tissue beyond the apparent outline of their skeleton. Leave room and avoid sharp or pressing supports. If there is no accessible, suitable base, choose a secure resting arrangement rather than forcing a glue joint. Our care guide to these three LPS corals explains placement considerations.
Underwater use does not mean instant load-bearing strength
Prepare tools, support and the small amount needed before starting. Keep a gel joint still until it has sufficient strength; an initial grip is not necessarily the fully cured bond. Unsupported pieces can also shift while epoxy sets. More adhesive therefore does not always solve what appears to be a weak attachment.
D-D Aquascape specifically warns against repeatedly working Aquascape in a stocked aquarium. If this clouds the water, stop and aerate as instructed by the manufacturer. That guidance concerns that product; do not combine unrelated curing instructions from different adhesives.
Three checks before you let go
- Does a stable base carry the weight without trapping tissue?
- Can the coral expand clear of sharp edges and neighbouring corals?
- Has the connection set sufficiently according to the product instructions?
Check the placement again later. A secure frag should still be accessible for sensible care. Appropriate frag mounts and propagation accessories can provide a clean base, but they cannot replace a suitable coral position or the adhesive instructions.