Mandarin - Green

Overview

The Green Mandarin is one of the most visually spectacular fish in the marine hobby, with an intricate psychedelic pattern of blue-green swirls and orange lines covering its entire body. Despite the vivid colouration, it's a genuinely challenging species to keep long-term, since its natural diet consists almost entirely of tiny live copepods and amphipods hunted continuously throughout the day.

Success with this species depends heavily on the tank having an already well-established population of copepods in the live rock and sand bed, ideally built up over many months before the fish is introduced. Tanks under around 300 litres, or newer systems without a mature pod population, generally cannot sustain a Mandarin long-term without significant supplemental feeding.

Given the right conditions — a mature, pod-rich tank and a feeding plan in place — it's a peaceful, endlessly fascinating fish to watch, but it's not a good candidate for a new tank or a first marine fish purchase.

Compatibility

Green Mandarins are entirely peaceful and reef safe, posing no risk to corals or invertebrates. They should not be housed with other dragonets, mandarins, or heavy pod-eating wrasses unless the tank is very large and extremely well stocked with a natural pod population, since they will compete for the same slow-moving live food and the weaker feeder can starve unnoticed.

They mix well with other calm, non-competing community fish that won't stress them or dominate feeding.

Health & quarantine

The single biggest health risk with this species is slow starvation, which can go unnoticed for weeks before becoming visibly obvious through a pinched, concave belly. A long feeding-trial-based quarantine is strongly recommended, ideally confirming the fish is actively hunting and gaining weight before considering it settled. This species also lacks scales and has a thin protective slime coat, so it should never be treated with copper-based medications.