Heteractis crispa is a large host anemone with long, tapering, often purple-tipped tentacles on a leathery column. Naturally hosts several clownfish species, but it is an advanced animal — wild-collected specimens frequently arrive bleached and struggle to recover.
ℹ️
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Oral disc 6-12 in (15-30 cm) across; tentacles up to several inches long
Lifespan
20–80 years
Social needs
solo
Native region
Indo-Pacific and Red Sea reefs
Origin
Old World
Climate
🌴 Tropical
Water type
🌊 Marine
Family
Stichodactylidae
Genus
Heteractis
Part of the Sea Anemones
Stinging, sessile cnidarians ranging from clownfish-hosting giants to nano-sized carpet species. Many are demanding, mobile, and can sting corals or be drawn into pumps — careful placement and rock-stable water are essential.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Established 30-gal reef
30+ gal cycled 6+ mo / SG 1.025 / Alk 8-9 / NO3 < 10
Anemones need ESTABLISHED reefs — never new tanks. Strong reef-spectrum light, moderate flow. They WANDER — secure intake guards (anemone-rated covers on powerheads). Sebae (Heteractis crispa) hosts clownfish but is HARDER than BTA — many wild specimens are dyed; insist on aquacultured.
Photo coming soon
Recommended
Mature 75-gal reef
75+ gal mature reef / strong light / chaotic flow
Mature reef with stable parameters + strong reef-spectrum LED + chaotic flow. Will host compatible captive-bred clownfish (Bubble Tip = Amphiprion ocellaris/percula; Carpet/Magnificent/Sebae host larger clowns).
Photo coming soon
Ideal
Show reef + bonded clownfish pair
100+ gal show reef + pair of clownfish
Mature 100+ gal show reef with a bonded pair of CAPTIVE-BRED clownfish hosting. Wild-caught anemones bleach easily; insist on aquacultured/maricultured stock. Sebae (Heteractis crispa) hosts clownfish but is HARDER than BTA — many wild specimens are dyed; insist on aquacultured.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Planula larva
Corals begin as a free-swimming planula larva released into the water column after spawning or brooding. The tiny, ciliated larva drifts and swims until it finds suitable hard substrate to settle on.
Photo coming soon
Single polyp
Once settled, the larva metamorphoses into a single founding polyp that secretes a calcium-carbonate (or proteinaceous) base and extends a ring of tentacles to feed. Reef-building corals begin laying down skeleton at this stage.
Mature colony
The founding polyp buds asexually into a colony of many genetically identical polyps, building the species' characteristic growth form — branching, plating, encrusting, or massive. A mature colony can reproduce and contributes to reef structure.
Color & pattern variants
Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.
Natural
representative
Purple Tip
Tan to brown leathery column with long tentacles tipped in purple or magenta — the classic healthy, fully pigmented color form.
representative
Bleached White (trade)
Stark white specimens that have expelled their zooxanthellae. Often mis-sold as a desirable 'white sebae' but are stressed and require feeding to survive and re-color; not recommended for beginners.
Requires a **large, very mature reef tank, ideally 50+ gal (190+ L)** with abundant rock and open swimming/expansion space. Do NOT add to a tank under ~6-12 months old. Parameters must be rock-stable: temperature **76-80 F (24-27 C)**, salinity **1.025-1.026 SG**, pH **8.1-8.4**, alkalinity **8-9 dKH**, calcium **420-440 ppm**, magnesium **~1300 ppm**, nitrate/phosphate low. It anchors its foot deep in rockwork, often burying the column with the disc exposed.
Substrate
Provide a **deep, stable rock structure** for the foot to anchor into, ideally over a sand bed so it can choose a rock crevice. It buries its leathery column and exposes the disc. Avoid loose rock that could shift and crush or dislodge it.
Equipment & setup
**Strong reef lighting (PAR ~150-250+)** and **moderate, turbulent flow** that does not blast the disc. Heater, reliable salt mix, and a strong protein skimmer for clean water are essential. **Critically, guard all pump/powerhead intakes and overflows** with foam/screens — wandering anemones drawn into pumps is a leading cause of death and tank disasters.
Diet
**Photosynthetic** via zooxanthellae, but a host anemone needs regular feeding to stay healthy — offer chunks of meaty seafood (mysis, silversides, raw shrimp/fish) every 3-7 days, sized to the mouth. A bleached (white) specimen has lost its algae and depends almost entirely on feeding until it re-colors; do not buy bright-white 'sebae' expecting them to be hardy.
Behavior & temperament
Sessile but **mobile** — it will walk on its foot to find preferred light/flow and can wander into powerheads and overflows (screen intakes). Tentacles carry a **potent sting** that can kill or damage nearby corals it touches, so leave a wide buffer. It can also sting the aquarist; handle minimally and wash hands. Hosts clownfish such as Clark's, pink skunk, and others, though tank-bred clowns may ignore it.
Health
Notoriously difficult: most are wild-collected, and bleached, damaged, or starved animals are common in the trade, leading to high losses. A healthy anemone is firmly attached, has inflated tentacles, and a closed/retentive mouth. **Warning signs:** a gaping or 'vomiting' mouth, deflating, detaching, or releasing stringy tissue — often a precursor to death, at which point it must be removed before it crashes water quality. Buy only colored, firmly attached, feeding specimens.
Tips, DIY & hacks
This is not a beginner anemone; choose a tank-raised or well-established colored specimen over a cheap bleached one. Acclimate slowly (drip), and let it choose its own spot rather than gluing it. Feed regularly, keep parameters laser-stable, and never house with corals it can reach. If it detaches and goes mobile, find and fix the cause (light/flow) and protect pump intakes immediately. Not CITES-listed, but some source countries regulate or limit anemone export.