Fire Engine Rhodactis Mushroom Coral

Fire Engine Rhodactis Mushroom Coral

Overview

Fire Engine Rhodactis Mushroom Coral shows bright red to orange, bumpy discs with short, knobby tentacles. Classified as Rhodactis sp., it is a soft mushroom coral that does well in low to moderate light and gentle to moderate water flow. It hosts symbiotic algae for photosynthesis but accepts small meaty foods; occasional target feeding can speed growth and deepen color. Place on rock or sand with room to spread, and leave space from stinging neighbors.

Quick Facts

Care Easy
Lighting Low–Moderate
Flow Low–Moderate
Placement Low–Mid
Temperament Semi-aggressive (3–6 inches spacing)

Recommended Parameters

Temp 76–80°F
pH 8.1–8.4
Salinity 1.025–1.026
Calcium 380–420 ppm
AlkAlkalinity 8–10 dKH
Magnesium 1250–1350 ppm
Feeding photosynthetic, mysis shrimp, enriched brine shrimp, finely chopped seafood, copepods, microplankton, coral-specific microfoods, marine snow

Care & Placement

Fire Engine Rhodactis Mushroom Coral (Rhodactis sp.) thrives in stable, nutrient-rich reef systems with low to moderate light and gentle, indirect flow. Aim for 50–100 PAR; too much light can cause bleaching or washed-out color, so start shaded and move gradually brighter over 2–3 weeks. Provide low to moderate flow that keeps the disc gently moving without lifting its tissue; this helps prevent detritus buildup. Target feed small meaty foods (mysis, finely chopped shrimp, reef roids) once or twice weekly, but avoid overfeeding to keep nutrients in check. Maintain temperature 76–79°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 2–15 ppm, and phosphate 0.03–0.08 ppm. Test weekly and prioritize stability; Rhodactis is sensitive to rapid swings, especially in alkalinity and light.Place low to mid in the tank on rubble or rock where the foot can attach; avoid burying in sand. Leave 3–5 inches of space—while the sting is mild, these mushrooms expand, can shade neighbors, and may spread quickly. Generally peaceful with soft corals and LPS; keep distance from torches, hammers, and aggressive sweepers. Acclimate with a 30–45 minute drip and light-reduction method (screen or dimmed lights). Dip new arrivals to limit pests. Signs of stress include gaping mouth, excessive slime, or tissue recession; check for salinity/alkalinity swings, reduce light, and lower flow if the disc lifts. If spreading is a concern, isolate on an “island” rock for easier control. Gently baste off trapped debris as needed.

FAQ

Frequently Asked Questions

About the Fire Engine Rhodactis Mushroom Coral

  • Why does my Fire Engine Rhodactis swell like a balloon or fold inward at times?
    Short-term “ballooning” often follows feeding, sudden light changes, or salinity swings as the polyp adjusts internal water. It may also preface a split. Check salinity stability, lower flow if it’s being tossed, and reduce PAR if recently moved up. Nighttime inflation is common. Persistent deflation with mucus suggests irritation or infection—inspect for vermetids, bristleworms, or debris under the disc.
  • How can I keep its vivid red from fading to brown or green?
    Aim for moderate PAR (about 60–120) with strong blue/UV spectrum and restrained white. Keep nutrients stable (nitrate ~5–15 ppm, phosphate ~0.03–0.1 ppm); ultra-low nutrients wash out reds. Feed small meaty items occasionally to support pigments. Avoid aggressive carbon dosing and frequent spectrum swings. Stable iodine levels help overall polyp health but don’t chase numbers.
  • Can this mushroom sting neighbors or capture fish?
    It has a moderate sting and can overgrow zoanthids and other softies; allow 3–4 inches of space and avoid direct contact. Large, sticky individuals can trap small or sleeping fish, especially gobies or chromis, at lights-out. Provide flow so food doesn’t settle on the disc and place it away from slow, bottom-resting fish. Most mobile inverts coexist fine.
  • How do I handle a “melting” episode after shipping or a sudden slump?
    Treat promptly: iodine or broad-spectrum antibacterial dips, increased aeration, stable temperature, and reduced light. Run fresh carbon to counter chemical warfare from leathers or euphylliids. Siphon decay, perform small daily water changes, and avoid heavy target feeding during recovery. Check for irritants (vermetid webs, sand under the disc). If tissue loss progresses, isolate in a low-flow hospital basket.