Why does my Christmas Favia change from deep red/green to washed-out colors under new lights?

Favia favus often bleaches or shifts pigment under high PAR or white-heavy spectra. Aim for 80–150 PAR with a blue-leaning spectrum to preserve red and fluorescent green. Acclimate slowly (10–15% intensity increase per week). Maintain stable nutrients (nitrate 5–15 ppm, phosphate 0.03–0.1 ppm); ultra-low nutrients fade colors. Consistent alkalinity (8–9 dKH) helps prevent stress-related paling.

My colony extends long sweepers at night and stings neighbors—can I curb this without moving it?

Give 3–6 inches of space and moderate, randomized flow to keep tentacles from settling on nearby corals. Target feed small meaty foods shortly after lights out; a well-fed colony often shows shorter, more predictable extension. Avoid sudden pH/alk swings that increase aggression. If needed, place it on an isolated rock or sand “island” to create a safe perimeter.

The edges are receding while the center looks fine—what’s the best rescue plan?

Edge recession often follows sediment buildup, algae encroachment, or laminar flow hitting one side. Increase cross-flow, gently turkey-baste detritus, and trim nearby nuisance algae. Perform an iodine or broad-spectrum coral dip, then spot feed to stimulate recovery. If tissue loss accelerates or brown jelly appears, siphon affected areas and consider cutting healthy sections between corallites with a diamond saw.

Is my coral actually Favia favus or a similar brain coral?

Favia favus has distinct corallites with their own walls; Favites species often share walls. Under magnification, look for separate rims around each polyp arranged in a honeycomb pattern. Mouth spacing is slightly wider in F. favus, and the colony tends to form low mounds rather than tight, blocky ridges. Correct ID informs spacing, as some look-alikes have even longer sweepers.

Christmas Favia Coral

Favia

Overview

Christmas Favia Coral shows red and green polygonal corallites with raised ridges. Favia favus is a stony, dome-forming brain coral; it prefers moderate lighting and low to moderate, steady water flow. It is photosynthetic via symbiotic algae but accepts small meaty foods at night, which can improve growth and coloration. Place with space around it, as its sweeper tentacles can sting nearby corals after lights out.

Quick Facts

Care Moderate

Lighting Low–Moderate

Flow Low–Moderate

Placement Low–Mid

Temperament Aggressive (6–8 inches spacing)

Recommended Parameters

Temp 76–80°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, mysis shrimp, enriched brine shrimp, finely chopped seafood (clam, shrimp, krill), zooplankton, microplankton, cyclops, marine snow, coral-specific powdered foods (e.g., Reef-Roids)

Care & Placement

Christmas Favia Coral (Favia favus) thrives with stable, moderate conditions and gentle husbandry. Provide moderate light (PAR ~80–150) and low–moderate, indirect flow to keep polyps inflated and prevent detritus from settling without blasting tissue. Feed 1–3 times weekly after lights out with small meaty foods (mysis, brine, reef roids); target feeding improves growth and color. Keep temperature 75–79°F (24–26°C), salinity 1.025–1.026 (35 ppt), pH 8.0–8.4, alkalinity 8.0–9.5 dKH, calcium 400–450 ppm, magnesium 1250–1350 ppm, nitrate 2–10 ppm, and phosphate 0.03–0.08 ppm. Test weekly, verify salinity with a calibrated refractometer, and maintain carbonate hardness and calcium via regular water changes or dosing. This species dislikes rapid parameter swings and overly intense light, which can cause bleaching or tissue recession.Place on the sandbed or lower–mid rockwork with indirect light; start low and gradually increase exposure over 2–3 weeks. Allow 3–6 inches of space from neighbors—night sweeper tentacles can extend 2–4 inches and sting nearby corals. Acclimate with a 30–60 minute drip and dip to exclude pests. Common issues: recession from alkalinity swings, brown jelly infections, and burning from direct flow. If fading or bleaching, reduce light intensity and improve nutrition; if tissue recedes, check alkalinity, pests, and flow, and consider moving to slightly lower light with steadier conditions. Keep the base clear of debris and avoid placement where sandstorms can abrade tissue.

FAQ

Frequently Asked Questions

About the Christmas Favia Coral

Why does my Christmas Favia change from deep red/green to washed-out colors under new lights?

Favia favus often bleaches or shifts pigment under high PAR or white-heavy spectra. Aim for 80–150 PAR with a blue-leaning spectrum to preserve red and fluorescent green. Acclimate slowly (10–15% intensity increase per week). Maintain stable nutrients (nitrate 5–15 ppm, phosphate 0.03–0.1 ppm); ultra-low nutrients fade colors. Consistent alkalinity (8–9 dKH) helps prevent stress-related paling.
My colony extends long sweepers at night and stings neighbors—can I curb this without moving it?

Give 3–6 inches of space and moderate, randomized flow to keep tentacles from settling on nearby corals. Target feed small meaty foods shortly after lights out; a well-fed colony often shows shorter, more predictable extension. Avoid sudden pH/alk swings that increase aggression. If needed, place it on an isolated rock or sand “island” to create a safe perimeter.
The edges are receding while the center looks fine—what’s the best rescue plan?

Edge recession often follows sediment buildup, algae encroachment, or laminar flow hitting one side. Increase cross-flow, gently turkey-baste detritus, and trim nearby nuisance algae. Perform an iodine or broad-spectrum coral dip, then spot feed to stimulate recovery. If tissue loss accelerates or brown jelly appears, siphon affected areas and consider cutting healthy sections between corallites with a diamond saw.
Is my coral actually Favia favus or a similar brain coral?

Favia favus has distinct corallites with their own walls; Favites species often share walls. Under magnification, look for separate rims around each polyp arranged in a honeycomb pattern. Mouth spacing is slightly wider in F. favus, and the colony tends to form low mounds rather than tight, blocky ridges. Correct ID informs spacing, as some look-alikes have even longer sweepers.

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