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Saltwater Aquarium Guide Reef-keeping magazine
Coral Care

Coral Frag Mounting Guide: Glue, Epoxy, and Plug Techniques

How to securely mount frags using cyanoacrylate gel, two-part epoxy, and the right frag plug placement.

Small coral frags mounted on plugs and arranged on a plastic grid rack
Photo: Robert Howie (rmhowie), CC BY-SA 2.0, via Flickr (cropped)

A well-mounted frag grows; a loose frag tumbles, gets stung, and dies. Three techniques cover almost every coral mounting situation.

Cyanoacrylate gel

Best for SPS frags on plugs. Apply a pea-sized blob, press in place underwater for 20 seconds.

Two-part epoxy

Best for LPS and large softie colonies. Knead until uniform color, press into rockwork crevices.