Whammin Watermelon Zoa: Propagation Guide

Propagating the Whammin Watermelon zoa (Zoanthus sp.), a pink-skirt green-center morph, by severing the stolon mat and mounting frags, with required palytoxin precautions.

Overview

Whammin Watermelon is a designer color morph of Zoanthus (family Zoanthidae) recognized by a bright pink skirt around a green center. It is one of an almost never-ending list of named strains the hobby has produced from these colonial button polyps. The polyps of a colony stay joined by a stolon, or coenenchyme mat, and Zoanthus is noted for a large number of distinct morphs within the same or similar species.

Reproductive Mode

Propagation in the aquarium is entirely asexual. A colony grows because offspring polyps remain attached to the parent by a fleshy stolon, and the mat buds new polyps outward across the rock. Hobbyists exploit this same stolon-and-budding biology to expand a Watermelon colony rather than relying on any sexual reproduction.

Fragging / Asexual Propagation

Identify the polyps to remove and cut through the connecting stolon mat with a sharp razor blade.
Follow the score line with coral cutters so the piece detaches; a diamond band saw is reserved for thick rock chunks.
Prepare a soaked, dried frag plug or rubble, dry the underside of the frag, and dab on cyanoacrylate glue.
Set the frag on the plug, hold briefly while the glue cures, then place it back in the tank.
Recovery is confirmed when fresh tissue and new polyps appear.

Conditions for Propagation

These corals are hardy and forgiving, accepting lighting anywhere from lower to higher intensities over an 8 to 12 hour photoperiod. Healing frags do best in moderate to higher flow, which delivers nutrients to the polyps and removes waste. Left to grow, the stolon spreads and adjacent frags merge into a colorful mat.

Palytoxin Safety

Zoanthids and the closely related Palythoa can contain palytoxin, ranked among the most poisonous non-protein substances known. Wear gloves and eye protection during every cut, keep hands away from the face, and wash thoroughly afterward. Do not boil, heat, or scrape the rock, as this can aerosolize the toxin for inhalation. No antidote exists; care is limited to treating symptoms.

Common Challenges

After fragging, polyps often stay shut for a few days as the cut heals; steady water chemistry and gentle current speed the process. The pink-and-green coloration that defines Watermelon can shift with lighting and nutrient levels. The most serious challenge is handling palytoxin safely, not the cutting technique itself.