Midas Blenny S (1.26-2")

The Midas Blenny, Ecsenius midas, is an elongated Indo-Pacific reef blenny cloaked in golden-orange to deep golden-yellow, frequently accented with blue around the chin and eyes. Reliable identifying marks include a black spot surrounding the anus and a narrow dark margin along the leading edge of the dorsal fin, while adults develop an elongated, lyre-like tail. One of its more remarkable traits is the ability to shift coloration rapidly to resemble nearby schooling fishes, a behavior tied to its habit of mixing with anthias above the reef. Maximum length is roughly 5 inches, and its eel-like, open-water swimming sets it apart from the more substrate-bound members of the genus.

House adults in a mature, well-established marine aquarium of at least 30 gallons. Build the rockwork with abundant live rock featuring narrow holes, nooks, and crevices the blenny can perch on and back into for shelter, but leave generous open midwater space, since this species spends much of its day swimming above the reef rather than resting on it. Good circulation suits it well, as wild fish occupy coastal and outer reef walls exposed to moderate current. A tight-fitting lid or secure cover is not optional: the Midas Blenny is an accomplished jumper, and open-top systems frequently end in loss.

In the wild, this omnivore hovers above the reef and feeds chiefly on plankton, making it considerably more planktivorous than the algae-grazing blennies it is often grouped with. That distinction matters in captivity, because a diet built only around dried algae will leave the fish thin. Offer mysis shrimp, vitamin-enriched brine shrimp, and other plankton-based frozen preparations as the foundation, supplemented with finely chopped crustacean or mollusk flesh.

Round out the menu with vegetable matter such as frozen herbivore preparations, Spirulina-based foods, nori, and microalgae, which also help satisfy any grazing impulse and reduce the chance of nipping elsewhere in the tank. Feed small portions two or three times daily and watch body condition closely, particularly in the first weeks. Newly introduced specimens can be shy and may retreat to the rockwork, so avoid boisterous feeders that intercept food before the blenny emerges.

Mysis Shrimp Vitamin-Enriched Brine Shrimp Frozen Plankton Chopped Crustacean Flesh Chopped Mollusk Flesh Frozen Herbivore Preparations Spirulina Foods Nori And Microalgae
Peaceful and conspicuously active, the Midas Blenny divides its time between perching in rock holes and cruising midwater with a distinctive eel-like undulation. In nature it often joins passing anthias schools and adjusts its color to blend with them, and captive fish frequently mimic that behavior around free-swimming planktivores. Territorial tendencies surface mainly in cramped quarters or toward fishes of similar shape, so generous swimming room and multiple shelter holes go a long way. Keep one per aquarium unless a confirmed mated pair is available, and avoid aggressive tankmates that could confine it to the rocks or block it from feeding.

This species is considered reef compatible and is well suited to reef aquaria, with no documented species-specific predation on shrimp, crabs, or snails. That said, husbandry references for the genus note that individual Ecsenius blennies occasionally nip at coral polyps or clam mantles, especially when underfed, so consistent feeding is the best insurance. The better-documented compatibility concern involves small fishes: firefish, gobies, and other diminutive planktivores may be chased or nipped, so choose tankmates with that in mind.

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FAQ

Frequently Asked Questions

About the Midas Blenny

  • What tank size and layout does a Midas Blenny need?
    Provide at least 30 gallons with plentiful live rock offering tight shelter holes and perches, open midwater swimming room, and good circulation. A securely fitted lid is essential because this species jumps.
  • Is the Midas Blenny primarily an algae eater?
    No. Unlike many related blennies, it feeds chiefly on plankton in nature, so small meaty planktonic foods should lead the diet alongside suitable vegetable-based preparations offered two or three times daily.
  • Is it suitable for a peaceful reef community?
    Yes, it is regarded as peaceful and reef compatible. Cramped conditions can bring out territorial behavior, and small planktivores such as firefish, gobies, and similar-shaped blennies may be harassed.