Propagating Sunburst Paly (Palythoa sp.)

A practical guide to dividing the Sunburst Palythoa colony for propagation, covering its mat-based asexual growth and the essential palytoxin handling rules.

Overview

Sunburst is a bright color morph of Palythoa, a colonial zoanthid of the family Sphenopidae in the order Zoantharia. The polyps grow with their bases joined inside a common tissue mat, the coenenchyme, rather than as standalone animals. This connected structure is the basis for how the morph is divided and shared between tanks.

Reproductive Mode

In the aquarium, growth is overwhelmingly asexual: polyps bud off the spreading mat and the colony expands across whatever surface it touches. Propagation simply takes advantage of this, cutting an established cluster free so it can continue the same encrusting growth on a new base.

Fragging / Asexual Propagation

Fragging is performed by separating a group of polyps from the parent mat and fixing it to a plug or rock. Because the colony is continuous tissue, the cleanest cuts follow the coenenchyme between polyp clusters; a multi-polyp frag re-establishes more reliably than a lone polyp and encrusts over the new base within weeks.

1. Identify a cluster of healthy polyps with open, brightly colored oral discs.
2. Cut or peel the cluster from the colony along the connecting mat tissue.
3. Attach the frag to a clean plug or rock with the tissue in contact with the surface.
4. Place the frag in gentle flow and stable water until it grips and spreads.

Conditions for Propagation

Fresh frags do best under medium PAR light and low flow that matches the parent colony, with stable salinity, temperature, and alkalinity. Strong direct current over a new cut can dislodge the piece before it attaches, so ease it into flow gradually.

Safety

Many Palythoa carry palytoxin, an extremely potent non-protein toxin with no known antidote. It is dangerous on skin contact, in the eyes, and especially as an inhaled aerosol. Every fragging or maintenance session on this colony should be treated as a potential exposure.