Why does my ACI Jinx Favia inflate at night and send out long sweepers—how much space should I give it?

Favia favus extends feeder and sweeper tentacles after lights out, often 1–3 inches, to capture food and defend territory. Give at least 3–4 inches of clearance from neighbors, more if near aggressive LPS (e.g., Galaxea, torch). Strong, direct flow can cause tentacles to lash farther, so use moderate, indirect flow to limit collateral stings.

My Jinx Favia’s orange/green colors are fading under strong LEDs—what adjustments preserve its pop without browning?

Start near 80–120 PAR and slowly move to 120–180 PAR if desired. Prioritize blue spectrum for fluorescence but avoid blasting with white channels. Keep nitrate 5–15 ppm and phosphate 0.03–0.08 ppm; ultra-low nutrients wash out pigments. Stable alkalinity (8–9 dKH) and adequate potassium help maintain reds/oranges; iron/manganese support greens.

It’s receding from the rim in small patches—what uncommon causes should I check besides basic parameters?

Look for vermetid snails irritating tissue with mucous webs, and for chronic laminar flow hitting the same ridge. Check for nocturnal stings from hidden sweepers (yours or neighbors). After fragging or bumps, watch for brown jelly; respond with iodine or broad-spectrum coral dips, siphon decay, increase gentle flow, and reduce organics to curb opportunistic bacteria.

What’s the safest way to frag a Jinx Favia without triggering polyp bailout or infections?

Use a diamond band saw to cut the skeleton between corallites, avoiding mouths. Make clean, swift cuts; don’t crush with bone cutters. Rinse, then dip in iodine or an antiseptic coral dip. Mount on stable plugs and provide moderate, intersecting flow. Hold PAR on the lower end for a week, and feed lightly at night to speed recovery.

ACI Jinx Favia Coral

Favia

Overview

ACI Jinx Favia Coral shows tight honeycomb corallites with raised walls and distinct mouths. Favia favus is a large-polyp stony coral forming dome-like colonies, preferring moderate light and gentle to moderate water flow. It is photosynthetic with symbiotic algae but benefits from occasional small meaty feedings, which support growth and color. Provide several inches of space for nighttime sweeper tentacles and place on stable rockwork.

Quick Facts

Care Easy

Lighting Low–Moderate

Flow Moderate

Placement Low–Mid

Temperament Aggressive (3–6 inches spacing)

Recommended Parameters

Temp 76–80°F

pH 8.1–8.4

Salinity 1.025–1.026

Calcium 400–450 ppm

AlkAlkalinity 8–10 dKH

Magnesium 1280–1350 ppm

Feeding photosynthetic, mysis shrimp, enriched brine shrimp, finely chopped marine meat (krill, clam), zooplankton, microplankton, powdered coral foods (e.g., Reef-Roids)

Care & Placement

ACI Jinx Favia Coral (Favia favus) prefers stable, moderate conditions. Provide moderate light (PAR 80–150); start lower and increase slowly over 1–2 weeks to avoid bleaching. Aim for moderate, indirect flow that keeps the surface clean without folding polyps; this helps prevent detritus buildup and tissue recession. Target feed 2–3 times weekly after lights out with small meaty foods (mysis, calanus, reef roids); feeding supports growth and color. Maintain temperature 76–79°F, pH 8.1–8.4, salinity 1.025–1.026, calcium 400–450 ppm, alkalinity 8.0–9.5 dKH, magnesium 1300–1400 ppm, nitrate 5–15 ppm, phosphate 0.03–0.08 ppm. Test weekly (more often after changes), keep swings small, and avoid alkalinity shifts greater than 0.5 dKH per day. Use an auto top-off for salinity stability.Place low to mid in the tank on stable rock with moderate spacing; allow 3–6 inches from neighbors as this coral extends sweeper tentacles at night. Keep away from highly aggressive corals (e.g., Galaxea, some Euphyllia) and encrusting species that can overrun it. Acclimate with a temperature match and coral dip, then light acclimation. Signs of stress: pale tissue (too much light or low nutrients), receding edges (unstable parameters, pests, or too little flow), slimy tissue (possible bacterial issue—improve flow, siphon, and consider a targeted dip). Keep the skeleton free of algae by maintaining flow and nutrients; if algae appears on bare spots, reduce light, improve flow, and feed to encourage regrowth. Regular, small maintenance changes beat large corrections.

FAQ

Frequently Asked Questions

About the ACI Jinx Favia Coral

Why does my ACI Jinx Favia inflate at night and send out long sweepers—how much space should I give it?

Favia favus extends feeder and sweeper tentacles after lights out, often 1–3 inches, to capture food and defend territory. Give at least 3–4 inches of clearance from neighbors, more if near aggressive LPS (e.g., Galaxea, torch). Strong, direct flow can cause tentacles to lash farther, so use moderate, indirect flow to limit collateral stings.
My Jinx Favia’s orange/green colors are fading under strong LEDs—what adjustments preserve its pop without browning?

Start near 80–120 PAR and slowly move to 120–180 PAR if desired. Prioritize blue spectrum for fluorescence but avoid blasting with white channels. Keep nitrate 5–15 ppm and phosphate 0.03–0.08 ppm; ultra-low nutrients wash out pigments. Stable alkalinity (8–9 dKH) and adequate potassium help maintain reds/oranges; iron/manganese support greens.
It’s receding from the rim in small patches—what uncommon causes should I check besides basic parameters?

Look for vermetid snails irritating tissue with mucous webs, and for chronic laminar flow hitting the same ridge. Check for nocturnal stings from hidden sweepers (yours or neighbors). After fragging or bumps, watch for brown jelly; respond with iodine or broad-spectrum coral dips, siphon decay, increase gentle flow, and reduce organics to curb opportunistic bacteria.
What’s the safest way to frag a Jinx Favia without triggering polyp bailout or infections?

Use a diamond band saw to cut the skeleton between corallites, avoiding mouths. Make clean, swift cuts; don’t crush with bone cutters. Rinse, then dip in iodine or an antiseptic coral dip. Mount on stable plugs and provide moderate, intersecting flow. Hold PAR on the lower end for a week, and feed lightly at night to speed recovery.

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