Rastas Zoa: Propagation Guide

How to propagate the Rastas zoa (Zoanthus sp.), a red-yellow-green hobby color morph, by cutting the stolon mat between polyps and mounting frags, with mandatory palytoxin safety.

Overview

Rastas is a named hobby color morph of the genus Zoanthus (family Zoanthidae), distinguished by red, yellow, and green polyps. Like all named zoas, it is not a separate species but a selected colony of the colonial 'button polyp' corals that hobbyists circulate under trade names. Zoanthus polyps remain connected to one another by a stolon network, or coenenchyme mat, and the genus is known for displaying a large number of color morphs of the same or similar species.

Reproductive Mode

In aquaria, zoanthids are propagated asexually. Colonies form because the offspring of an original polyp remain attached to each other by a fleshy stolon or mat, and new polyps bud along that mat to spread across rock. This budding is the natural growth mode hobbyists rely on; no sexual spawning is needed to expand a Rastas colony.

Fragging / Asexual Propagation

Select polyps near the colony edge and slice through the stolon mat between them with a clean razor blade.
Trace the cut line with coral cutters so the section breaks free cleanly; for thick rock bases a diamond band saw is used.
Soak and dry a frag plug or piece of rubble, dry the base of the cut piece, then apply a small amount of cyanoacrylate glue.
Press the frag onto the plug, let the glue cure for a few seconds, and return it to the tank.
The frag is established once it produces new tissue and polyps.

Conditions for Propagation

Zoanthus are among the hardiest and easiest corals to keep, tolerating a range of lighting from lower to higher levels with roughly 8 to 12 hours of light per day. Place healing frags where they receive moderate to higher water flow so nutrients reach the polyps and waste is carried away. Grouped frags can be allowed to expand into a 'garden' as the stolon spreads across the substrate.

Palytoxin Safety

Some zoanthids contain palytoxin, one of the most poisonous non-protein substances known. Wear gloves and eye protection while fragging, avoid touching the face, and wash hands afterward. Never boil, heat, or aggressively scrape rock holding these corals, because heating can aerosolize the toxin and make it inhalable. There is no antidote; only symptoms can be treated.

Common Challenges

Freshly cut polyps may stay closed for several days while the wound heals; stable parameters and gentle flow help recovery. Color intensity of named morphs such as Rastas depends on light and water quality, and slow-growing colonies expand only gradually along the stolon. The main risk in propagation is mishandling palytoxin rather than the cut itself.