First, make sure the fish is already well-fed on pods in a mature tank so it isn’t starving during training. Then: 1) Use live foods that move in the water column and look similar to pods, like live baby brine shrimp or live enriched adult brine. Feed in a small feeding station (a shallow glass dish or feeding ring) in the same spot daily so the fish learns “this is where food appears.” 2) Once it reliably visits the station, start mixing a small percentage of frozen baby brine shrimp or frozen cyclops with the live food. Use a turkey baster or pipette to gently squirt the food right in front of the mandarin’s normal hunting route or into the dish, keeping flow low so food lingers. 3) Gradually increase the ratio of frozen to live as you observe it picking at non-moving food. Look for the fish pecking off the dish floor or grabbing slower-moving items. 4) When it consistently takes frozen cyclops or baby brine, introduce small, finely shaved pieces of high-quality frozen mysis (e.g., Hikari or PE; chop or blend so pieces are tiny). Mix them with the frozen foods it already accepts. 5) Keep multiple small sessions per day rather than one big feeding, since mandarins prefer continuous picking. Watch body condition: the belly should be rounded, not pinched. If weight drops, increase pod availability and back off on the intensity of training. This process can take weeks; the key is consistency, low competition from tankmates, and maintaining a strong natural pod population while you transition.

You can’t rely on “it looks like a mature tank” alone. Use these checks: 1) Nighttime glass check: After lights out, use a flashlight with a red or dim filter and inspect front and side glass. A healthy pod population usually shows dozens to hundreds of tiny white/clear specks darting around, especially near film algae and in low-flow areas. 2) Rock and refugium shake test: Gently shake or baster-blast some rubble rock over a white container of tank water; you should see many small crustaceans and larvae. If you have a refugium, repeat the test there; it should be dense with pods. 3) Mandarins’ behavior and body condition: A well-fed mandarin spends the entire day methodically pecking, with a rounded chest and belly and no “sharp” look behind the head. If it starts cruising rapidly, “searching” more frantically, spends more time in open water, or the belly looks sunken, it’s likely running low on pods. 4) Time in hobbyist’s care without supplemental feeding: In a tank under ~75–80 gallons without a large, mature refugium, many mandarins slowly lose weight over several months. If you see gradual slimming despite apparent pods, your tank likely isn’t producing enough. If in doubt, add pod cultures regularly (from reputable sources), feed phyto to the refugium to support pod reproduction, reduce competition from other pod-grazers (wrasses, scooters, some gobies), and ensure dense rockwork and macroalgae zones where pods can breed without being constantly hunted.

That behavior is often normal courtship or territorial display, but context matters: 1) Spawning behavior (with a pair): Near dusk, both fish rise slowly in the water column side by side, bodies almost touching, with extended dorsal and pectoral fins. They often perform short vertical ascents and descents at the same spot. Just before egg release, they may rise high, press vents together briefly, then separate and sink. If you see synchronized rises repeatedly near lights-out, that’s typical spawning behavior. 2) Solo “practice” or display: A lone mandarin may perform mini-rises and flares toward its reflection in the glass or near high-flow/light areas, especially around dusk. It looks similar but lacks the coordinated pairing; this is still normal and usually not a concern. 3) Aggression: Aggressive behavior is more erratic; you’ll see chasing, short bursts of speed, and direct charges at another mandarin or similarly shaped fish, sometimes with fin nipping. The “loser” hides or shows pale stress coloration. 4) Stress: Signs include faded or blotchy color, clamped fins (opposite of a proud flare), rapid breathing, or repeatedly dashing into glass or equipment. If the “dance” is happening randomly all day, with heavy breathing or other fish harassing it, look for bullying, poor water quality, or parasites. In most peaceful tanks, a dusk “dance” with big fin displays and gentle rises is a good sign that the fish is comfortable and following its natural daily rhythm.

For a mandarin-centered reef, the key is low competition for pods and gentle surroundings: Helpful tankmates and setups: - Peaceful, non-pod-focused fish: clownfish (not overly aggressive strains), firefish, some fairy and flasher wrasses that prefer water-column foods, chromis, small anthias that eat broadcast foods, and many blennies that mostly graze algae. - Invertebrates: cleaner shrimp, peppermint shrimp (true ones, not camel shrimp), snails, and most hermits are fine. Avoid excessive numbers of small hermits that strip biofilm and microfauna from rock surfaces. - Equipment: a refugium with chaeto or other macroalgae on a reverse light schedule, gentle tumble and periodic phyto dosing to feed pods; minimal or adjustable flow so some areas have lower velocity where food can settle and pods proliferate; a fine-mesh guard on intakes so pods and the mandarin’s fins aren’t damaged. Sabotaging choices: - Heavy pod predators: sixline wrasses, melanurus and other Halichoeres wrasses, scooter “blennies” (actually dragonets), many leopard wrasses, and some hawkfish compete aggressively for pods and can starve a mandarin in smaller systems. - Big, boisterous or aggressive fish: large damsels, overly territorial clown pairs, dottybacks, and some tangs may harass the mandarin or outcompete it at any feeding station. - Excessively sterile systems: aggressive mechanical filtration (roller mats, frequent sock changes) and oversized UV run 24/7 can strip planktonic stages of pods. If you use them, leave one section “softer” (e.g., sockless refugium) so pods can breed. Plan your livestock list and filtration so the mandarin isn’t outgunned for every piece of natural microfauna in the system.

Several targeted factors affect color in mandarins: 1) Diet diversity: A pod-only diet can sustain them, but vibrant coloration often improves when they also receive carotenoid-rich foods. If yours accepts prepared foods, rotate in high-quality frozen mysis, enriched brine, small plankton blends, and occasionally finely chopped seafood soaked in vitamin and carotenoid supplements (e.g., products with astaxanthin or beta-carotene). If it won’t take prepared foods, culture and seed a variety of pods (Tigriopus, Tisbe, Apocyclops) and feed live phyto regularly; different pod species and phyto strains contain different pigments. 2) Lighting: Extremely bright, white-heavy lighting can visually wash out colors, especially if the fish often stays in open, brightly lit zones. Moderate intensity, with a reasonable blue component, tends to make mandarins’ reds, oranges, and blues look more saturated, similar to dusk conditions on the reef. 3) Stress and tankmates: Chronic harassment or competition can cause duller, more blotchy appearance. A calm tank, stable rockwork with many caves and overhangs, and minimal chasing allow it to maintain full coloration. 4) Water quality and stability: Stable salinity (around 1.025–1.026), low nutrients but not ultra-zero (nitrate 2–10 ppm, phosphate 0.02–0.08 ppm), and good oxygenation support overall health and pigment production. Swings in temperature or salinity often correlate with temporary color fade. 5) Genetics and origin: Wild individuals vary naturally; some are inherently more vivid. Also, stress from recent shipping and acclimation can take weeks to months to resolve before the fish displays its full color potential. Ensure it’s settled, well-fed, and undisturbed, and you’ll usually see colors deepen over time.