Ocellaris clownfish reef compatibility check
Amphiprion ocellaris
Ocellaris clownfish (Amphiprion ocellaris) is a beginner-level clownfish that needs at least 20 gallons. It is listed as reef safe; best planned as a single fish or bonded pair. Temperament is territorial and adults reach about 3.5 inches. ReefCrafter schedules it as early-stage livestock, with no tank-age gate beyond a finished cycle.
Hardy first fish with strong personality and excellent reef compatibility.
Who it is for
Good fit for
- ✓ Tanks of 20+ gallons at the animal's adult size.
- ✓ Beginners following a slow, planned stocking order.
- ✓ Newly cycled tanks with a compatible stocking list.
- ✓ Reef tanks with corals and invertebrates.
Not a fit for
- ✕ Tanks under 20 gallons, even while it is small.
- ✕ Best planned as a single fish or bonded pair.
Compatibility warnings
- Best planned as a single fish or bonded pair.
- Works well in peaceful beginner reefs when the tank is at least 20 gallons.
- Hosting an anemone is optional; the anemone is the harder animal, not the clownfish.
- Add assertive tankmates carefully once the pair claims a corner.
Professional planning context
- Use the 20 gallon minimum as an adult-planning floor; display length, aquascape, and existing tankmates can raise that floor.
- This can be planned early after cycling, but only after quarantine/acclimation logistics and stocking order are settled.
- Professionals should model aggression by territory and introduction order, not only by care level.
Tank fit and maturity gate
ReefCrafter uses 20 gallons as the planning floor for adult size, swimming room, nutrient load, and aggression margin.
This species can be planned early when the tank is cycled and the rest of the stocking list is compatible.
Care notes
- Temperament
- Territorial
- Reef safety
- Safe
- Adult size
- 3.5 in
- Placement
- water column
- Diet
- Prepared frozen, pellet, and meaty foods.
- Flow
- Varied
- Light
- None
- Bioload
- 1.4
- Stocking stage
- Early
Related species
- Black ocellaris clownfish
Same 20-gallon floor.
- Ocellaris clownfish pair
Same 20-gallon floor.
- Percula clownfish
Same 20-gallon floor.
- Pink streaked wrasse
Same 20-gallon floor.
Equipment that fits
- Waterbox Cube 20 Nano AIO Aquarium
20-gallon display, above this animal's 20-gallon floor.
- Fiji Cube 22.4 Gallon Rimless AIO Nano Aquarium PRO Series
22-gallon display, above this animal's 20-gallon floor.
- Innovative Marine 25 NUVO Fusion PRO 2 AIO Lagoon Aquarium with APS Pedestal
25-gallon display, above this animal's 20-gallon floor.
Related reading
Questions
What size tank does the ocellaris clownfish need?
ReefCrafter plans for at least 20 gallons, based on an adult size of about 3.5 inches, plus swimming room, nutrient load, and aggression margin. Use the adult size, not the size at purchase.
Is the ocellaris clownfish reef safe?
It is listed as reef safe in ReefCrafter's catalog. Watch for: Best planned as a single fish or bonded pair.
Is the ocellaris clownfish good for beginners?
Yes. It is rated beginner care.
When should I add the ocellaris clownfish to my tank?
ReefCrafter treats it as early-stage livestock, with no tank-age gate beyond a finished cycle. Add livestock slowly so nutrient export keeps up.