Evermann's cardinalfish
Zapogon evermanni
Evermann's cardinalfish has a streamlined body with striking yellowish-bronze scales and prominent black spots along its flanks.
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About the Evermann's cardinalfish
This is a reef cave-dwelling cardinalfish that likes to hang way back in the shadows and will even cruise the cave ceilings upside-down, which is super fun to watch. It is more of a dusk/night kind of fish, usually seen alone or in pairs, and it is a mouthbrooder like a lot of cardinalfish.
Also known as
Quick Facts
Size
15 cm
Temperament
Peaceful
Difficulty
Expert
Min Tank Size
55 gallons
Lifespan
3-6 years
Origin
Indo-Pacific and Western Atlantic (circumtropical)
Diet
Carnivore - small meaty foods (copepods/mysis/brine, finely chopped seafood)
Water Parameters
25-29°C
8-8.4
7-12 dGH
Need a heater for this species?
This species needs 25-29°C in a 55 gallon tank. Use our heater calculator to find the right wattage.
Calculate heater sizeCare Notes
- Give them a dim, cave-heavy setup - rock overhangs, tight crevices, and low glare lighting. They stay out and look way calmer when they have multiple bolt-holes.
- Keep salinity stable around 1.025-1.026 and temp 75-79F; they do not love swings. Nitrate low (think single digits) helps them keep weight on and avoids that slow decline you sometimes see in deepwater cardinals.
- These guys can be picky and slow to eat, so feed after the lights ramp down or right at dusk. Start with live or frozen mysis, enriched brine, and copepods, then work toward small meaty pellets once they are settled.
- They are peaceful but easy to bully - skip aggressive wrasses, dottybacks, and pushy damsels that will outcompete them. Best tankmates are calm reef fish that do not live in the same caves (small gobies, passive anthias, mellow tangs in big tanks).
- Do not keep more than one unless you have a real bonded pair or a big system with lots of hiding spots; they can turn into cave-warriors at night. If you try a pair, add them together and watch for one getting pinned in a corner after dark.
- Quarantine is worth the hassle: they ship poorly and show velvet/ich fast when stressed. Also watch for refusal to eat in the first week - if they miss meals, switch to smaller live foods (pods, live brine) and feed more often until they lock in.
- If you ever get a male holding eggs (mouthbrooder behavior, swollen jaw, not eating), do not chase him with a net or he will spit. Keep the tank calm and let him ride it out, then be ready with tiny live foods for the fry if you actually want to try raising them.
Compatibility
Good Tankmates
- Other peaceful cardinalfish and small shoaling types (Banggai cardinals, Pajama cardinals) - they tend to just hover and mind their own business, and a small group looks way more relaxed than a solo fish
- Small, mellow gobies (Neon goby, Clown goby, Watchman goby) - different zone of the tank and no attitude, so everybody stays chill
- Firefish and dartfish (Firefish, Purple firefish) - same vibe: peaceful, hover-y, not looking to start anything, just give them bolt-holes so nobody spooks each other
- Blennies that are on the calm side (Tailspot blenny, Midas blenny) - they perch and graze while the Evermann's hangs in the water column, usually zero drama
- Reef-safe wrasses that are not bullies (Possum wrasse, Pink-streaked wrasse) - active but not mean, and they do not usually bother cardinals if there is plenty of rockwork
- Small, peaceful basslets (Royal gramma) - generally fine as long as the gramma has its cave and the cardinals have their shady overhangs
Avoid
- Big aggressive stuff that treats small fish like snacks (groupers, lionfish, frogfish) - Evermann's are bite-sized and will just vanish one night
- Territorial bruisers (dottybacks, large damselfish, maroon clowns) - they will harass a peaceful hover-fish into hiding and not eating
- Nippy, in-your-face wrasses (Sixline wrasse, Fourline wrasse) - some are fine, but the spicy ones love to pick at calm fish and keep them stressed
Where they come from
Evermann's cardinalfish (Zapogon evermanni) is one of those deep-ish, secretive little cardinals that tends to show up around reefs where there are lots of cracks, ledges, and caves to duck into. They are not a "hang in the open all day" fish like some of the more common Apogon/Cardinal species you see in shops. Think low light, structure, and keeping close to cover.
If yours spends the first week glued to a cave and only comes out at feeding time, that's normal. Mine did the exact same thing.
Setting up their tank
This is a fish that rewards you for building the tank around its comfort level. Give it lots of rockwork with real bolt-holes - narrow crevices, overhangs, little caves. Big open aquascapes look cool, but this species tends to stay stressed and invisible in them.
I keep them best in quieter systems. Strong random flow is fine, but avoid blasting their favorite hiding zone with a powerhead. If they can pick a calm pocket to hover in, they'll settle faster.
- Tank size: I would not bother under 30-40 gallons, and bigger is easier if you want tankmates
- Rockwork: multiple caves/crevices so they can choose a spot and still get away from other fish
- Lighting: they do better with shaded areas; bright bare tanks keep them on edge
- Filtration: stable, mature tank; they do not love "new tank" swings
- Cover: a tight lid helps - startled cardinals can jump
They are touchy about stability. If your tank is the kind that swings salinity or temp between water changes, this is not the fish to test that with.
What to feed them
Plan on feeding like they're picky at first, because a lot of them are. Mine came in eating only moving foods. Once settled, they usually take frozen well, but you may have to earn it.
Start with small meaty stuff: live or enriched frozen is your friend. After they recognize you as "food," you can wean them onto frozen staples. They have small mouths, so big chunks just get mouthed and spit.
- Good starters: live baby brine, live copepods, live blackworms (rinse well), small live shrimp if available
- Frozen they usually accept: mysis (small), calanus, finely chopped krill, enriched brine, fish eggs/roe
- Prepared: some will take tiny pellets eventually, but I would not rely on it early on
- Feeding rhythm: small meals 1-2x daily is better than dumping a lot at once
If it refuses frozen, try turning off flow for a few minutes and target feed near its cave with a pipette. Get the food to drift past its face. Once it takes a few bites, you're halfway there.
How they behave and who they get along with
Evermann's is generally peaceful, but it is not bold. The main issue is not that it will beat up other fish - it's that other fish will outcompete it, stress it out, or keep it pinned in hiding. In a busy reef with aggressive feeders, you can "have" one and never actually see it eat.
They do best with calm tankmates and a feeding plan that gives them a fair shot. If you want a cardinal that hangs front-and-center, this probably isn't it. If you like shy reef fish that reward patience, you'll enjoy them.
- Good tankmates: small gobies, blennies, firefish (in mellow tanks), smaller wrasses that are not food-crazed bullies, peaceful angels in large systems
- Use caution with: dottybacks, hawkfish, big wrasses, triggerfish, large grammas, anything that owns caves aggressively
- Avoid: predators that see a small cardinal as a snack, and hyper-competitive feeders that vacuum food instantly
Cave space matters. If a more dominant fish claims the same holes, your cardinal may stop coming out to eat. Add extra hiding spots, not just "more rock."
Breeding tips
Like many cardinalfish, they are mouthbrooders. If you end up with a true pair (or buy a confirmed pair), you may see the male hold eggs/larvae in his mouth and stop eating for a while. The problem in a typical reef is that the babies become plankton snacks fast.
If you want to attempt raising them, the best shot is moving the holding male to a quiet, dim rearing tank right before release, or collecting larvae at night using a dim light and a larval trap. You'll need live foods ready (rotifers first, then copepod nauplii), and clean, stable water. This is why I call them an "expert" project.
Do not try to "help" by forcing the male to spit. You can injure or kill the fish, and you'll usually lose the brood anyway.
Common problems to watch for
Most issues I see with Evermann's are really acclimation and feeding problems that snowball. A shy fish that isn't eating becomes a thin fish, and thin fish get sick easily. Watch body shape from the side - the belly should not look pinched.
- Refusing food: usually stress, too much light, too much competition, or food is too large
- Getting bullied off its cave: leads to hiding and starvation - add caves or rethink tankmates
- Crypt/velvet: they can be sensitive; quarantine and observation are worth the effort
- Bacterial issues after shipping: ragged fins, cloudy eyes, sores - often tied to stress and poor water stability
- Jumping: spooks at night or during maintenance if the tank is uncovered
If you only do one thing for success: quarantine, then introduce it to a mature tank with calm fish and lots of shade. Getting them eating confidently is the whole game with this species.
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