Alien Antivenom Zoanthids Coral (Zoanthus sp.) thrive under stable, clean conditions with moderate light and flow. Aim for PAR 80–150; start low and increase slowly to avoid bleaching. Provide moderate, varied flow to keep detritus from settling and to reduce film algae on polyps. Target-feed once or twice weekly with fine particle foods (reef roids, powdered plankton) or broadcast very lightly; they gain much of their energy from light but feedings can support growth and color. Keep temperature 24–26°C/75–78°F, salinity 1.025–1.026, pH 8.1–8.4, alkalinity 8–9.5 dKH, calcium 400–450 ppm, magnesium 1250–1350 ppm. Test weekly with reliable kits and use a refractometer for salinity; these corals dislike swings, especially in salinity and alkalinity.Place frags low to mid in the tank on isolated rocks to manage spread. Give 2–3 inches of space from aggressive neighbors (e.g., LPS with long sweepers); Zoanthus are generally peaceful but can overgrow slower corals. Acclimate by dripping 30–45 minutes, then dip with a coral dip to remove pests (zoa-eating nudibranchs, sundial snails). Light-acclimate with reduced intensity or screen for 5–7 days. Common issues: closed polyps (check for pests, low flow, or high nutrients), bleaching (too much light too fast), and “melting” from unstable parameters or bacterial stress—improve flow, perform small water changes, and correct chemistry. Handle with gloves and eye protection; some zoanthids can contain palytoxin.