The symbiotic relationship between clownfish and anemones is one of nature's most iconic partnerships. The clownfish gains protection from predators within the anemone's stinging tentacles, while the anemone benefits from the clownfish's waste as a nutrient source and the fish's territorial behavior to ward off butterflyfish that might otherwise eat the anemone.
Quick facts
| Scientific name | Amphiprion spp. / Entacmaea quadricolor |
| Max size | Varies |
| Min tank size | 40 gal (150 L) |
| Temperament | Peaceful |
| Diet | Omnivore (both) |
| Reef safe | Yes |
| Care level | Moderate |
| Origin | Indo-Pacific |
Overview
The following sections detail exactly how to keep this species thriving in a saltwater reef environment.
Tank requirements
Anemones require established, stable tanks—wait at least 6–12 months after cycling before adding one. Bubble-tip anemones (Entacmaea quadricolor) are the easiest host species and accept the widest range of clownfish. Provide strong lighting (PAR 200+) and moderate flow. Ensure all powerhead intakes are covered since anemones can move and get shredded.
Water parameters
Maintain standard reef aquarium parameters for long-term health:
- Temperature: 75–80 °F (24–27 °C)
- pH: 8.0–8.4
- Salinity: 1.024–1.026 sg
- Alkalinity: 8–11 dKH
- Ammonia / Nitrite: 0 ppm
- Nitrate: < 20 ppm (lower is better for a reef)
Stability is more important than hitting a specific number. Avoid sudden swings in any parameter.
Diet and feeding
Feed the anemone small pieces of raw shrimp, Mysis, or silversides 1–2 times per week. The clownfish will often bring food to the anemone. Do not overfeed—uneaten food pollutes the water. The anemone also receives nutrition from its symbiotic zooxanthellae under proper lighting.
Behavior and compatibility
Not all clownfish species host all anemone species. The most reliable pairings are Ocellaris/Percula clownfish with bubble-tip anemones. Captive-bred clownfish may take days or weeks to recognize and host an anemone. Avoid keeping multiple anemone species together as they may engage in chemical warfare.
Breeding
A hosted pair is more likely to breed, as the anemone provides a sense of security. Eggs are typically laid on rock adjacent to the anemone base.
Tips for success
- Start with a bubble-tip anemone (BTA)—they are the hardiest and most commonly hosted species.
- Cover all powerhead intakes with foam guards before adding an anemone.
- Do not move or touch the anemone once it settles—let it find its preferred spot.
- Ensure your lighting provides at least 200 PAR at the anemone's position.
- If the anemone starts wandering, check water parameters and lighting—something is off.
Frequently asked questions
Which anemone is best for clownfish?
The bubble-tip anemone (Entacmaea quadricolor) is the best choice for most hobbyists. It is the hardiest host anemone species and is accepted by nearly all Amphiprion clownfish species. Rose bubble-tips (RBTA) are a popular color morph.
How long until my clownfish hosts an anemone?
It can take anywhere from minutes to months. Wild-caught clownfish usually host immediately, while captive-bred fish may take weeks or may never host. Be patient and avoid forcing the interaction.
Can an anemone sting my other corals?
Yes. Anemones have potent nematocysts and will sting and kill any coral they come in contact with. This is a major reason anemones can be risky in mixed reef tanks. Give them plenty of space from corals.
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