Best Clownfish Tank Mates for Saltwater Aquariums

Clownfish are among the most popular saltwater aquarium fish because they are hardy, colorful, widely available, and usually compatible with many peaceful community fish. The best clownfish tank mates are peaceful to moderately assertive species that will not bully the clownfish, compete aggressively for the same territory, or try to eat them.

The best clownfish tank mates include gobies, blennies, royal grammas, cardinalfish, firefish, small basslets, certain wrasses, dwarf angelfish, tangs in large tanks, cleaner shrimp, hermit crabs, and hardy beginner corals like toadstool corals, mushroom corals, and hammer corals.

Avoid large predatory fish, overly aggressive damselfish, most additional clownfish, tube anemones, condylactis anemones, and delicate species that require specialized feeding or mature reef systems.

Best clownfish tank mates at a glance

What makes a good clownfish tank mate?

A good clownfish tank mate should share the same basic saltwater aquarium conditions, tolerate a similar diet, and have a compatible temperament. The best choices are usually peaceful, hardy, appropriately sized, and unlikely to compete directly with clownfish for the same small territory.

Clownfish can be peaceful, but they are not passive. Once established, they may defend a corner, rock, coral, anemone, or nesting area. That is why tank mate selection should consider both the species and the order in which fish are added.

Good clownfish tank mates usually have these traits

• Peaceful or semi-peaceful temperament
• Appropriate adult size for the aquarium
• Different preferred swimming area or territory
• Hardiness suitable for a beginner or intermediate saltwater tank
• Compatibility with standard clownfish foods
• No strong predatory risk to clownfish or ornamental shrimp
• No extreme feeding specialization

Best order for adding clownfish tank mates

The order in which fish are added to a saltwater aquarium can make a major difference. Adding a compatible fish in the wrong order can still create unnecessary aggression if the more territorial fish becomes established first.

As a general rule, add the most peaceful and shy fish first, then add bolder or more territorial fish later. This gives timid fish a chance to settle in before the stronger personalities claim space.

Suggested stocking order

1. Firefish, purple firefish, small gobies, and other shy fish
2. Cardinalfish, blennies, and peaceful basslets
3. Clownfish, if they are not already the first fish in the tank
4. Wrasses, dwarf angelfish, hawkfish, and other semi-assertive fish
5. Tangs and larger active swimmers in appropriately sized tanks

This order will not make incompatible fish compatible, but it can reduce territorial conflict among otherwise reasonable choices.

How to acclimate new clownfish tank mates

Acclimation helps reduce stress when moving a new fish from shipping or store water into your aquarium. The goal is to gradually adjust the new fish to the temperature and water chemistry of your tank.

Basic drip acclimation steps

1. Turn off or dim the aquarium lights.
2. Open the bag and gently transfer the fish and bag water into a clean aquarium-safe bucket or container.
3. Use airline tubing or a drip acclimation kit to start a slow siphon from the aquarium into the bucket.
4. Target a slow drip rate, roughly a few drops per second.
5. After about 30 minutes, remove about half of the water from the bucket and continue dripping.
6. After another 30 minutes, gently transfer the fish into the aquarium using a container or net.
7. Do not pour the store or shipping water into the display tank.
8. Leave the lights off or dim for the rest of the day to reduce stress.

For best results, quarantine new fish before adding them to the display tank. Quarantine gives you time to observe feeding, breathing, swimming behavior, and visible signs of disease before the new fish is introduced to your clownfish and other livestock.

The most common clownfish tank mates

In a Saltwater Aquarium Blog community survey, readers reported successfully keeping clownfish with a wide range of fish groups. These were the most commonly reported clownfish tank mate categories:

1. Gobies
2. Wrasses
3. Tangs
4. Blennies
5. Angelfish
6. Basslets and grammas
7. Chromis
8. Dottybacks
9. Cardinalfish
10. Anthias

These are broad categories, and not every species within each group is equally suitable. Always check the adult size, temperament, feeding needs, and tank size recommendation for the specific species before buying.

Best clownfish tank mates for a 20-gallon tank

A 20-gallon tank can work well for a pair of clownfish and a small number of carefully selected tank mates. The 20-gallon long aquarium is usually better than the 20-gallon high because the longer footprint gives fish more horizontal swimming room and more usable territory.

In a 20-gallon clownfish tank, focus on small, peaceful fish that do not need large territories or heavy feeding.

10 good clownfish tank mates for a 20-gallon tank

1. Neon goby
2. Tailspot blenny
3. Royal gramma
4. Banggai cardinalfish
5. Pajama cardinalfish
6. Firefish
7. Purple firefish
8. Court jester goby
9. Blackcap basslet
10. Flame hawkfish

The flame hawkfish is a borderline choice in a small tank and is not ideal if you want to keep small ornamental shrimp. For a beginner 20-gallon clownfish tank, the safest choices are usually small gobies, a tailspot blenny, a royal gramma, or one cardinalfish.

You can learn more about other good options in this guide to saltwater fish for a 20-gallon tank.

Best clownfish tank mates for larger tanks

Larger aquariums give you more options, but they also require more planning. Active swimmers like tangs and wrasses need swimming room. Dwarf angelfish can be beautiful additions, but they may nip at corals or clams. Some wrasses need sand to sleep in, and many are jumpers that require a tight-fitting lid.

10 good clownfish tank mates for larger aquariums

1. Blue tang
2. Yellow tang
3. Coral beauty angelfish
4. Flame angelfish
5. Marine betta
6. Fairy wrasse
7. Kole tang
8. Aiptasia-eating filefish
9. Yellow coris wrasse
10. Melanurus wrasse

Best invertebrate clownfish tank mates

Clownfish tank mates do not have to be fish. Invertebrates can add color, movement, algae control, scavenging, and natural behavior to a reef tank. Some corals may even be used by clownfish as a substitute host.

10 good invertebrate tank mates for clownfish

1. Toadstool coral
2. Hermit crab
3. Hammer coral
4. Skunk cleaner shrimp
5. Mushroom corals
6. Fire shrimp
7. Green star polyps
8. Peppermint shrimp
9. Xenia coral
10. Bubble tip anemone

Toadstool corals, hammer corals, and mushroom corals are popular options because clownfish may choose to spend time in them as a substitute host. That behavior is not guaranteed, but it is common enough to make these corals interesting choices for a clownfish tank.

Cleaner shrimp and fire shrimp can add interesting behavior, and hermit crabs can be useful members of the clean-up crew. Green star polyps and xenia are hardy and attractive, but both can spread quickly, so place them where they can be managed.

If you want an anemone for clownfish, the bubble tip anemone is often the best starting point. Wait until the aquarium is stable and mature before adding an anemone, and make sure your lighting, flow, and water quality are appropriate.

Clownfish tank mate compatibility rules

Most compatibility problems come from territory, size, aggression, or feeding specialization. A fish that looks harmless at the store may become a problem once it claims a cave, corner, coral, or anemone.

Avoid overcrowding similar fish

In smaller tanks, avoid adding multiple fish that use the same territory in the same way. For example, do not add several cave-defending species to a small aquascape and expect them to divide the space peacefully.

You can keep a pair of clownfish of the same species, but avoid mixing multiple clownfish species in most home aquariums. A pair of ocellaris or percula clownfish is usually much easier to manage than a mixed group of different clownfish.

Be careful with pairs

Some gobies and cardinalfish can be kept as pairs, but pairing works best when the fish are compatible. Two fish of the same species are not automatically a pair. If they are not compatible, one may bully the other.

Think about adult size, not store size

Many saltwater fish are sold as juveniles. A small fish at the store may become too large, too aggressive, or too active for a small clownfish tank. Plan around adult size and long-term behavior.

Clownfish tank mates to avoid

Some fish and invertebrates are poor choices for clownfish tanks because they are predatory, aggressive, too delicate, or likely to sting or harm clownfish.

10 potential clownfish tank mates to avoid

1. Lionfish
2. Snowflake eels
3. Panther groupers and other large groupers
4. Ribbon eels
5. Damselfish
6. Green chromis
7. Mandarinfish
8. Other clownfish species
9. Tube anemones
10. Condylactis anemones

Large predatory fish like lionfish, groupers, and eels may eat clownfish. Damselfish and chromis are related to clownfish and can become surprisingly aggressive in community tanks. Other clownfish species often create territorial conflict.

Tube anemones and condylactis anemones are not natural host anemones for clownfish and may sting or injure them.

Mandarinfish are beautiful, but they are difficult to keep because many rely heavily on live copepods and do best in mature systems with abundant natural food. They are usually not a good choice for a new clownfish tank.

Practical stocking examples

Simple 20-gallon clownfish community

• Pair of ocellaris or percula clownfish
• One neon goby or tailspot blenny
• One royal gramma or one firefish
• Small clean-up crew
• Optional hardy beginner coral after the tank is stable

Medium reef tank community

• Pair of clownfish
• Royal gramma
• Tailspot blenny
• Firefish or cardinalfish
• Fairy wrasse
• Cleaner shrimp
• Hardy soft corals or LPS corals

Larger clownfish community

• Pair of clownfish
• Kole tang or yellow tang
• Coral beauty or flame angelfish
• Fairy wrasse or melanurus wrasse
• Marine betta
• Cleaner shrimp, if not keeping shrimp-eating predators

Related articles

• 19 best clownfish types
• Clownfish breeding
• Ocellaris clownfish care
• Snowflake clownfish
• Picasso clownfish
• Maroon clownfish
• Tomato clownfish
• Do clownfish eat their eggs?
• Clownfish and anemones

Conclusion

The best clownfish tank mates are peaceful, hardy species that fit the size and maturity of your aquarium. For smaller tanks, focus on gobies, blennies, royal grammas, cardinalfish, and firefish. For larger tanks, you can consider tangs, dwarf angelfish, wrasses, marine bettas, and other active community fish.

The safest approach is to plan the full stocking list before buying fish, add shy fish first, avoid overcrowding similar species, and skip predators or aggressive fish that can turn a clownfish community tank into a problem.

References

Michael, Scott W. Marine Fishes: 500+ Essential-to-Know Aquarium Species. T.F.H. Publications. Neptune City, NJ. 2001.

Saltwater Aquarium Blog Survey Data. 2022.

Ulrich III, Albert B. The New Saltwater Aquarium Guide. Saltwater Aquarium Blog Publications. 2014.

Wilkerson, Joyce D. Clownfishes: A Guide to Their Captive Care, Breeding & Natural History. T.F.H. Publications. Neptune City, NJ. 2001.