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Livestock · SPS Corals

Birdsnest Coral

Seriatopora hystrix

Delicate needle-thin branches — a fast, relatively forgiving intro to branching SPS.

Difficulty: Intermediate SPS coral (advanced)

Illustration of a Birdsnest Coral

Bird's Nest coral (Seriatopora hystrix) is a branching SPS of fine, needle-thin twigs — usually pink, green or cream — and one of the easiest branching SPS to start with. It grows fast, frags itself readily, and the one thing to respect is how fragile those thin branches are: they snap if bumped, and the tips brown or recede fast if light, flow or parameters swing.

📊 What keepers actually ask: The two recurring questions are “is bird's nest a good first SPS?” (yes — one of the easiest branching SPS) and “why did my bird's nest lose colour / recede?” — usually a parameter swing or a light/flow change it wasn't acclimated to.

Care at a glance

Colony / formA dense bush of fine, needle-thin branches; grows and branches quickly, and drops frags readily.
LightingStrong — roughly 200–400 PAR once acclimated (start a new frag around 50% intensity and raise slowly). Pinks want more light to hold colour; too much bleaches, too little browns it out.
Water flowModerate to high, random and turbulent — enough to keep detritus off the fine branches. Thin-branched colonies dislike one harsh direct stream; polyps retracting constantly means the flow's too strong.
PlacementUp in the light in a mature tank, with clear space around it — the branches are brittle and mustn't touch neighbours. Plan for fast outward growth.
Temperature78–82°F (25.5–28°C).
pH8.1–8.4.
Specific gravity1.023–1.026 (reef-standard ≈35 ppt).
Other targetsSPS build a dense stony skeleton and punish parameter swings far harder than LPS — keep alkalinity (≈8–11 dKH), calcium (≈400–450 ppm) and magnesium (≈1300–1400 ppm) rock-stable and test weekly. With SPS, stability beats any exact number.
FeedingMostly photosynthetic; no target-feeding needed. Benefits from the general food in a stocked reef.
Growth & spreadFast for an SPS — branches extend and multiply quickly, and dropped frags often settle and grow, so a small colony fills in fast.
Natural rangeIndo-Pacific.
Beginner-friendly, done right. One of the more forgiving branching SPS and a common “first branching SPS,” but it's still an SPS: it wants a matured tank (≈6+ months), stable alk/Ca/Mg, strong light and good turbulent flow. The signature caveat is fragility — the fine branches snap easily, and tissue can recede fast (STN) if you change light, flow or chemistry abruptly. Acclimate slowly and keep things stable.
What does a birdsnest coral really cost? The birdsnest coral itself is usually the cheapest part — the reef system is the real cost. See the honest birdsnest coral cost breakdown (upfront vs ongoing, and where it's safe to save). No prices quoted.
Keep those numbers steady. This coral's alkalinity, calcium and magnesium only keep it safe when they're stable. If one reads low, our free reef dosing calculator works out exactly how much to add for your water volume — and splits it safely over days.
Where does it go? Light, flow and placement make or break a coral. Our free coral placement guide shows the PAR, flow and tank zone this coral wants — and what else thrives in the same spot.

The fish store gets these wrong

Common myths, kindly corrected — no shame for having believed them.

  • “Bird's nest is too advanced for a first SPS.” It's actually one of the easiest branching SPS — a common gateway into branching corals — provided your tank is matured and your parameters are stable.
  • “If it browned out it needs feeding.” A browning bird's nest almost always needs more (acclimated) light or more stable water — not spot-feeding.
  • “Any strong flow is good for SPS.” The fine branches want random, turbulent flow, not one harsh direct jet — constant polyp retraction means it's too strong or too direct.

Before you buy

  • A matured tank (≈6+ months, ideally older) with stable alk/Ca/Mg you test weekly.
  • Space around it — brittle branches must not touch other corals, and it grows fast.
  • Strong light and turbulent flow, both acclimated slowly for a new frag.
  • Handle it by the base or plug, not the branches — they snap.

Signs something's wrong

A struggling coral is almost always telling you about light, flow or water — here's what to watch for:

  • Tips browning or fading — light too low or not acclimated, or nutrients off.
  • White skeleton appearing at branch bases and creeping up (STN) — a parameter swing or water-quality issue; frag ahead of the receding tissue and fix stability.
  • Polyps staying retracted — flow too strong or too direct.
  • Bleaching white all over — too much light too fast.

Work through the Birdsnest Coral trouble card — the water, light, flow and pest checks that fix almost every struggling coral.

Never

  • Never add it before the tank is matured and your parameters are stable — SPS punish swings.
  • Never handle it by the branches — they're brittle and snap.
  • Never let it touch neighbours — plan for fast growth and space it.
  • Never make sudden light, flow or chemistry changes — acclimate everything.

Common birdsnest coral questions

Is bird's nest coral a good beginner SPS?

It's one of the easiest branching SPS and a common first branching coral — fast-growing and relatively forgiving — but it's still an SPS, so it needs a matured tank, stable alkalinity/calcium/magnesium, strong light and good turbulent flow.

Why is my bird's nest coral losing colour or receding?

Usually a parameter swing or an un-acclimated change in light or flow. White skeleton creeping up from the base is tissue necrosis (STN) — frag ahead of it and fix your stability; browning tips usually mean it needs more (acclimated) light.

How much light and flow does bird's nest need?

Strong light (roughly 200–400 PAR once acclimated — start around 50% and raise slowly) and moderate-to-high random, turbulent flow to keep detritus off the fine branches. Avoid one harsh direct jet.

Why do the branches keep breaking?

They're naturally fine and brittle — that's normal for Seriatopora. Handle it by the base or plug, not the branches. The upside is that dropped pieces often settle and grow, so it frags itself easily.

How fast does bird's nest coral grow?

Fast for an SPS — the fine branches extend and multiply quickly and it frags itself readily, so a small colony can fill in a lot of space. Give it room from neighbours to start with.

🐚 Did you know? — Birdsnest Coral fun facts

Little true delights about the birdsnest coral — each one checked against a named source, no reef-store folklore.

  • The thin birdsnest coral weaves a tangled, bushy clump of fragile, slender branches with pointed tips that can grow to a metre across. Wikipedia
  • Every birdsnest coral is a hermaphrodite, with mature polyps making both sperm and eggs, and the mother colony broods its developing larvae until they are ready to swim. Wikipedia
  • Its larvae settle within about a day of release, so many baby corals put down roots just a few tens of metres from their parent. Wikipedia

More reef fun facts →

Sources & further reading

This guide was written and fact-checked against these authorities. It's honest, general guidance — not a diagnosis, and not a substitute for an aquatic vet or your own test kit:

Written and fact-checked by The Coralkin Team against marine-aquarist sources — if your birdsnest coral is struggling, it's almost always a light, flow or water-chemistry issue — check those first and ask an experienced reefer. We never guess a care number.

🔬 Review status: team-written and fact-checked against cited sources · not yet reviewed by a marine vet. How we research & fact-check →

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