Propagating Stargazer Paly (Palythoa sp.)

How to propagate the Stargazer Palythoa morph by dividing the colonial mat, plus mandatory palytoxin safety precautions for every step of the process.

Overview

Stargazer is a designer color form of the genus Palythoa, a colonial zoanthid in the family Sphenopidae within the order Zoantharia. As in all Palythoa, the individual polyps are partially embedded in an encrusting sheet of tissue known as the coenenchyme, so the colony grows as a connected mat rather than as separate animals. This shared tissue is what makes the group straightforward to divide for propagation.

Reproductive Mode

Palythoa colonies expand chiefly by asexual growth: new polyps bud from the spreading coenenchyme and the mat enlarges across the substrate. For the aquarist this means a healthy colony can be split into multiple pieces, each carrying several polyps, which then continue to encrust independently.

Fragging / Asexual Propagation

Because the polyps sit in a continuous mat, propagation is done by cutting or dividing a cluster of polyps away from the parent colony and attaching the piece to a fresh plug or rock. A frag carrying several connected polyps re-establishes faster than a single isolated polyp, and the cut edge encrusts onto the new base over the following weeks.

Select a section of mat that contains several polyps with healthy, fully open oral discs.
Separate the cluster from the colony along the coenenchyme, keeping each piece intact.
Secure the piece to a clean plug or rock so the tissue contacts the new surface.
Return the frag to gentle flow and stable conditions until it encrusts.

Conditions for Propagation

Recovering frags settle best under the same conditions the parent colony enjoys: medium PAR lighting, low flow, and stable reef parameters. Avoid strong direct current on a fresh cut so the tissue can knit to the plug before it is challenged by flow.

Safety

Palythoa species are a documented source of palytoxin, one of the most poisonous non-protein substances known. The toxin is hazardous through skin contact, eye exposure, and especially inhalation of aerosols, and there is no antidote. Any cutting or handling of this colony must be treated as a potential exposure event.