Green Phantom Pleco L200

That subtle blue-green sheen comes from iridophores, skin cells packed with stacked guanine crystal platelets that reflect light selectively depending on the angle you're viewing from — the same basic mechanism behind fish scale shimmer generally, just producing an unusually cohesive green-blue cast on this species rather than a scattered sparkle.

Care level: Easy · Temperament: Peaceful · Max size: ~5" · Min tank: 30 gal · Diet: Omnivore, algae wafers/veggies