My Pinwheel Zoanthids are “reaching” with long stalks and small heads—what’s causing this?

That stretching signals low PAR or stagnant flow. Bump light gradually to ~80–150 PAR, biasing blue spectrum, and add random, moderate flow to keep skirts moving without blasting the polyps. Keep nutrients non-zero (nitrate 5–15 ppm, phosphate 0.03–0.1) so color returns as light increases. Check shading from faster growers and remove film algae—both can trigger elongation and smaller crowns.

How do I keep the pinwheel pattern vivid instead of browning or washing out?

Maintain stable, moderate nutrients and strong blue spectrum (actinic/royal blue) for fluorescence, with white dialed back to avoid photobleaching. Avoid stripping nutrients with aggressive carbon dosing. Trace balance matters—regular water changes typically cover iodide/iron needs; dose only if you test. Keep alkalinity steady (7.5–8.5 dKH) and avoid abrupt light changes; ramp adjustments over 1–2 weeks to lock in color.

My colony closed and started “melting” after months of growth—what advanced troubleshooting works?

Suspect pests (zoa-eating nudibranchs, sundial snails, spiders), bacterial issues, or chemical warfare. Night-inspect and manually remove pests; dip with an iodine or commercial coral dip and repeat every few days to catch hatchlings. Increase random flow and run fresh carbon for allelopathy from leathers or euphylliids. Siphon detritus under the mat. If a section decays, frag away healthy edges to a clean plug to save the line.

Best practices to frag Pinwheel Zoanthids without losses?

Wear eye/skin protection and work in a ventilated area. Cut between polyps through the mat with a sharp scalpel; avoid crushing the foot. Mount to rough plugs with gel cyanoacrylate, then dip lightly in iodine. Heal in moderate flow and subdued light for 5–7 days. Keep nutrients stable and avoid handling until skirts extend. If slime accumulates, gently baste and increase crossflow to prevent bacterial film.

TSA Pinwheel Zoanthids Coral

Zoanthids

Overview

Pinwheel Zoanthids Coral shows compact, button-like polyps with radial striping around a contrasting center. Zoanthus sp. is a soft, colonial polyp coral that does well under moderate light and moderate, indirect flow. It is primarily photosynthetic via symbiotic algae but will accept fine particulate or small meaty foods, supporting faster growth and stronger color. Place on a separate rock to control spreading and leave space from stinging corals; handle with care, as some zoanthids may contain toxins.

Quick Facts

Care Easy

Lighting Low–Moderate

Flow Moderate

Placement Low–Mid

Temperament Peaceful to semi-aggressive (2–3 inches spacing)

Recommended Parameters

Temp 76–82°F

pH 8.1–8.4

Salinity 1.025–1.026

Calcium 400–440 ppm

AlkAlkalinity 8–10 dKH

Magnesium 1250–1350 ppm

Feeding photosynthetic (primary), microplankton, phytoplankton, zooplankton, rotifers, copepod nauplii, cyclops, powdered coral foods, amino acid supplements

Care & Placement

Pinwheel Zoanthids Coral (Zoanthus sp.) thrive in stable, nutrient-balanced systems with moderate light and flow. Target PAR around 80–150; acclimate to brighter LEDs gradually using a screen or reduced photoperiod to avoid bleaching, and increase light if polyps stretch. Provide moderate, indirect flow to keep detritus from settling while preventing polyps from being blasted shut. Feed once or twice weekly with fine particulate foods (reef roids, rotifers) or amino supplements; not mandatory, but supports growth and color. Maintain temperature 24–26°C (75–78°F), salinity 1.024–1.026, pH 8.1–8.4, alkalinity 8.0–9.5 dKH, calcium 400–450 ppm, magnesium 1250–1350 ppm, nitrate 2–10 ppm, phosphate 0.02–0.08 ppm. Test regularly with reliable kits, use a refractometer for salinity, and prioritize stability over chasing numbers.Place colonies low to mid in the tank with space around them; they spread by mats and can overgrow neighbors. Mount on an isolated rock “island” for control, and avoid proximity to corals with long sweepers (euphyllia, galaxea). Temperament is generally peaceful, but they compete by shading and crowding. Dip new frags to remove pests (zoa-eating nudibranchs, spiders) and wear eye/skin protection due to palytoxin risk. Common issues: closed polyps from pests, sediment, or unstable alkalinity; paling from excess light; recession in ultra-low nutrients. Troubleshoot by adjusting light/flow, restoring nutrients, improving stability, and re-dipping if pests persist. Regular small water changes and consistent dosing keep conditions steady for steady polyp growth.

FAQ

Frequently Asked Questions

About the TSA Pinwheel Zoanthids Coral

My Pinwheel Zoanthids are “reaching” with long stalks and small heads—what’s causing this?

That stretching signals low PAR or stagnant flow. Bump light gradually to ~80–150 PAR, biasing blue spectrum, and add random, moderate flow to keep skirts moving without blasting the polyps. Keep nutrients non-zero (nitrate 5–15 ppm, phosphate 0.03–0.1) so color returns as light increases. Check shading from faster growers and remove film algae—both can trigger elongation and smaller crowns.
How do I keep the pinwheel pattern vivid instead of browning or washing out?

Maintain stable, moderate nutrients and strong blue spectrum (actinic/royal blue) for fluorescence, with white dialed back to avoid photobleaching. Avoid stripping nutrients with aggressive carbon dosing. Trace balance matters—regular water changes typically cover iodide/iron needs; dose only if you test. Keep alkalinity steady (7.5–8.5 dKH) and avoid abrupt light changes; ramp adjustments over 1–2 weeks to lock in color.
My colony closed and started “melting” after months of growth—what advanced troubleshooting works?

Suspect pests (zoa-eating nudibranchs, sundial snails, spiders), bacterial issues, or chemical warfare. Night-inspect and manually remove pests; dip with an iodine or commercial coral dip and repeat every few days to catch hatchlings. Increase random flow and run fresh carbon for allelopathy from leathers or euphylliids. Siphon detritus under the mat. If a section decays, frag away healthy edges to a clean plug to save the line.
Best practices to frag Pinwheel Zoanthids without losses?

Wear eye/skin protection and work in a ventilated area. Cut between polyps through the mat with a sharp scalpel; avoid crushing the foot. Mount to rough plugs with gel cyanoacrylate, then dip lightly in iodine. Heal in moderate flow and subdued light for 5–7 days. Keep nutrients stable and avoid handling until skirts extend. If slime accumulates, gently baste and increase crossflow to prevent bacterial film.

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