Pale cardinalfish

Where they come from

Pale cardinalfish show up all over the Indo-Pacific, hanging under ledges and among branching corals in calm bays and lagoons. During the day they hover in the shade like little ghosts, then perk up at dusk to pick plankton from the water column. If you give them shadowy spots at home, they relax fast.

Setting up their tank

I like a 40-gallon or larger tank for a small group (5-7 fish). You can keep a trio in 30 gallons, but groups spread out any picking. They are reef-safe and pretty chill, but they do best with a lid and some quiet corners.

• Temperature: 75-79 F (24-26 C)
• Salinity: 1.024-1.026
• pH: 8.0-8.4, alkalinity around 8-10 dKH
• Nitrate: under 20 ppm, stable
• Flow: low to moderate with some sheltered eddies
• Lighting: medium with shaded areas; ramp-down at dusk helps feeding

Stack rock to make archways and shady alleys. Leave some open water in front of the rock for hovering. They appreciate a calmer zone where flow bounces off rock rather than blasting them. A ramping light schedule that gives a blue evening period makes them bolder.

What to feed them

They are micro-predators. Think small, meaty foods that drift by at mouth level. Feed in lower light or right after your lights ramp down. They usually learn frozen quickly, and you can train to small pellets once they are confident.

• PE mysis (chopped if large) and baby mysis
• Calanus and other tiny plankton blends
• Enriched brine shrimp (good for training, not the only food)
• Copepods (live or concentrated)
• Finely chopped clam, shrimp, or fish
• High-quality 0.5-1 mm marine pellets once they are eating well

How they behave and who they get along with

Peaceful, slightly shy, and happiest in a loose group. They hover mid-water under cover, then do short dashes to grab food. In a group they display less and eat better.

• Good neighbors: small gobies, blennies, firefish, peaceful wrasses (fairy/flasher), pipefish, small reef-safe angels, chromis, and most corals.
• Use caution: dottybacks, aggressive damsels, large hawkfish, triggers, or anything that mouths small fish.
• Inverts: fine with snails and larger cleaner shrimp. Super tiny shrimp (like sexy shrimp) can be viewed as snacks by some individuals.

Breeding tips

They are paternal mouthbrooders. In a calm, well-fed group, pairs form and the male will hold a clutch under his jaw for about 10-14 days. He usually stops eating during that time.

Raising the young is advanced. Unlike Banggai cardinals, most Taeniamia release tiny larvae that need planktonic food. Think rotifers and copepod nauplii, not crushed flake.

• Set up a 5-10 gallon blacked-out rearing tank with a seasoned sponge filter and gentle aeration.
• Keep a dense rotifer culture ready; enrich with algae or a commercial enrichment.
• Collect larvae at lights-out using a dim flashlight and a larval snagger, or move the holding male to a breeder box a day or two before release.
• Feed rotifers several times daily, maintain a light green tint (greenwater method), and do small, frequent water changes.
• Transition to newly hatched Artemia as size allows, then to frozen micro foods.

Common problems to watch for

• Not eating: too bright or too much competition. Dim the lights at feeding and offer smaller foods more often.
• Pinched belly: often worms or just not getting enough food. Quarantine and consider deworming; bump feeding frequency.
• Getting bullied: add more cover, rearrange rock, or rehome the aggressor.
• Ich or velvet: look for fine spots and fast breathing. Treat in QT; do not dose copper in your display.
• Mouth injuries: can happen on rough netting or rock. Use soft nets or cups to move them.
• Jumping during spooks: they are not the worst jumpers, but a tight lid saves surprises.

Stable water, shaded hangouts, and calm tankmates make these guys very easy to live with. If they look washed out and hang near the surface, something is off: check ammonia, salinity swings, and make sure they are actually getting food.