Why does my Rainbow Tiger Hammer’s color shift from rainbow tips to dull brown or green?

This morph’s fluorescence depends on spectrum, PAR, and nutrients. Under strong blue-heavy light with moderate PAR (120–180), pigments pop; too much white or sudden PAR spikes can wash colors. Ultra-low nutrients pale it; elevated but stable NO3 (5–15 ppm) and PO4 (0.03–0.08 ppm) deepen tones. Improve color by gradual light acclimation, stable alk 8–9 dKH, and consistent trace replenishment via regular water changes.

My Fimbriaphyllia paraancora is receding at the base but polyp tips look fine—cause and fix?

Branching hammers often recede from alk swings or direct, constant flow blasting the branch base. Check dKH stability (daily drift <0.3), reduce pointed flow, and redirect to a gentle, rolling sway. Siphon detritus trapped among branches. If tissue is peeling, perform an iodine or broad-spectrum coral dip, trim any necrotic branch below healthy tissue, and place in lower flow to heal.

Are torches and Rainbow Tiger Hammers compatible in close quarters?

Not reliably. Torches (F. glabrescens) often outcompete hammers with longer, more potent sweepers and can sting across gaps. Keep 10–15 cm spacing minimum, more if flow is strong. Hammers mix better with other hammers or frogspawn, but even then watch for chemical warfare in smaller systems—run fresh carbon and maintain good export to reduce allelochemicals.

What’s the best flow pattern to boost growth and prevent infections like brown jelly?

Aim for alternating, moderate flow that rocks tentacles without folding them over—think varied gyre or pulsed streams. Avoid laminar jets hitting a single head. This keeps mucus and detritus from settling in branch forks, reducing bacterial hotspots. Pair with stable temperature (24–26°C), consistent alkalinity and calcium, and prompt dips/quarantine after shipping to limit tissue damage and infection risk.

Rainbow Tiger Hammer Coral

Q: Are torches and Rainbow Tiger Hammers compatible in close quarters?

Not reliably. Torches (F. glabrescens) often outcompete hammers with longer, more potent sweepers and can sting across gaps. Keep 10–15 cm spacing minimum, more if flow is strong. Hammers mix better with other hammers or frogspawn, but even then watch for chemical warfare in smaller systems—run fresh carbon and maintain good export to reduce allelochemicals.

Q: What’s the best flow pattern to boost growth and prevent infections like brown jelly?

Aim for alternating, moderate flow that rocks tentacles without folding them over—think varied gyre or pulsed streams. Avoid laminar jets hitting a single head. This keeps mucus and detritus from settling in branch forks, reducing bacterial hotspots. Pair with stable temperature (24–26°C), consistent alkalinity and calcium, and prompt dips/quarantine after shipping to limit tissue damage and infection risk.

Hammers

Overview

Rainbow Tiger Hammer Coral shows branching heads with hammer- or anchor-shaped tips in striped colors. Fimbriaphyllia paraancora is a branching large-polyp stony coral; keep it under moderate light and gentle to moderate, indirect flow. It hosts symbiotic algae for photosynthesis but accepts small meaty foods or coral foods, which can support faster growth and stronger coloration. Place it with space from neighbors, as its sweeper tentacles can sting nearby corals.

Quick Facts

Care Moderate

Lighting Moderate

Flow Moderate

Placement Low–Mid

Temperament Semi-aggressive (6–8 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 1250–1350 ppm

Feeding photosynthetic, mysis shrimp, enriched brine shrimp, finely chopped marine meat (clam, shrimp, fish), zooplankton, microplankton, powdered coral foods, marine snow

Care & Placement

Rainbow Tiger Hammer Coral (Fimbriaphyllia paraancora) thrives with stable, moderate conditions. Provide low–moderate lighting (100–150 PAR; start at 80–100 and increase slowly) and gentle to moderate, indirect flow so the polyps sway without whipping. Feed 1–2 times weekly with small meaty foods (mysis, chopped krill, LPS pellets) or fine coral foods; target feed lightly to avoid fouling. Keep temperature 24–26°C (75–79°F), salinity 1.025–1.026, 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. Monitor with reliable test kits, a refractometer, and stable heating; avoid sudden swings, which can trigger tissue recession or brown jelly.Place mid to low in the tank on a stable rock ledge or cup on the sandbed (avoid sand contacting soft tissue). Allow 6–8 inches of space; night sweepers can sting neighbors. Generally safe with other Fimbriaphyllia hammers/frogspawn of the same species, but avoid torches and aggressive LPS. Acclimate by temperature matching and 30–45 minutes of drip acclimation, then light acclimate with screening or by starting lower in the tank. Signs of stress: bleaching (too much light), receding flesh (excess flow, low nutrients, or alk swings), gaping mouth (poor water quality). For brown jelly, promptly siphon, iodine dip, increase flow around the colony, and quarantine if possible. Inspect for damaged skeleton on arrival, dip for pests, maintain stable nutrients, and perform regular, small water changes to keep growth and color steady.

FAQ

Frequently Asked Questions

About the Rainbow Tiger Hammer Coral

Why does my Rainbow Tiger Hammer’s color shift from rainbow tips to dull brown or green?

This morph’s fluorescence depends on spectrum, PAR, and nutrients. Under strong blue-heavy light with moderate PAR (120–180), pigments pop; too much white or sudden PAR spikes can wash colors. Ultra-low nutrients pale it; elevated but stable NO3 (5–15 ppm) and PO4 (0.03–0.08 ppm) deepen tones. Improve color by gradual light acclimation, stable alk 8–9 dKH, and consistent trace replenishment via regular water changes.
My Fimbriaphyllia paraancora is receding at the base but polyp tips look fine—cause and fix?

Branching hammers often recede from alk swings or direct, constant flow blasting the branch base. Check dKH stability (daily drift <0.3), reduce pointed flow, and redirect to a gentle, rolling sway. Siphon detritus trapped among branches. If tissue is peeling, perform an iodine or broad-spectrum coral dip, trim any necrotic branch below healthy tissue, and place in lower flow to heal.
Are torches and Rainbow Tiger Hammers compatible in close quarters?

Not reliably. Torches (F. glabrescens) often outcompete hammers with longer, more potent sweepers and can sting across gaps. Keep 10–15 cm spacing minimum, more if flow is strong. Hammers mix better with other hammers or frogspawn, but even then watch for chemical warfare in smaller systems—run fresh carbon and maintain good export to reduce allelochemicals.
What’s the best flow pattern to boost growth and prevent infections like brown jelly?

Aim for alternating, moderate flow that rocks tentacles without folding them over—think varied gyre or pulsed streams. Avoid laminar jets hitting a single head. This keeps mucus and detritus from settling in branch forks, reducing bacterial hotspots. Pair with stable temperature (24–26°C), consistent alkalinity and calcium, and prompt dips/quarantine after shipping to limit tissue damage and infection risk.