Frag Plug

Definition

A frag plug is a small ceramic or aragonite disc (typically 1-1.5 inch diameter) used to mount coral fragments. The plug is glued or pressed into rockwork after the coral has encrusted onto it.

Practical use in aquariums

Buy plugs unaccompanied or pre-bonded with cyanoacrylate (CA) gel + reef putty. Soak new plugs in RODI water for 24 hours before use to leach any residue. Mount the frag with reef putty + a drop of CA gel - the putty holds shape, the CA flash-bonds the coral to the plug.

How Frag Plug fits the bigger picture

Understanding Frag Plug matters because it's connected to broader husbandry decisions: fragging skill compounds: the more you frag, the more you understand coral biology + propagate your own pieces.

Browse the Fast Aquatics care library for full husbandry tutorials covering Frag Plug in context.