Genicanthus lamarck
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The Lamarck’s Angelfish (Genicanthus lamarck) is a graceful, reef-safe swallowtail angel prized for its bold black striping, silver-white body, and striking sexual dimorphism—males develop longer tail streamers and deeper markings, while females keep a refined, understated look. A mid-water cruiser by nature, it spends most of its time in open water above the rockwork, adding constant motion without harassing corals.
Plan for a mature, oxygen-rich system of 90+ gallons for a single or bonded pair (aim 120–150+ gallons for a small harem), with strong surface agitation, ample swim space, and stable parameters (76–80°F, 1.024–1.026 SG, pH 8.1–8.4, alk 8–11 dKH, low nutrients). Peaceful to mildly assertive, Lamarck’s plays well with other community fish; avoid large aggressive angels and keep boisterous tankmates to a minimum. As a true planktivore, it’s one of the few angels considered reef-safe, rarely bothering corals or clams when well fed.
Diet is simple but frequent: offer small, meaty planktonic foods two to three times daily—mysis, calanus, copepods, finely chopped shrimp, and high-quality micro-pellets—plus a touch of spirulina or nori for variety.