Shortstripe goby

Geographical Origin and Habitat: Elacatinus chancei is native to the tropical waters of the Western Central Atlantic Ocean, with populations concentrated primarily in the Bahamas, the Caribbean, the Virgin Islands, and the Lesser Antilles. It inhabits healthy coral reefs at depths of 5 to 25 meters, showing a strict and specific mutualistic association with large tube sponges, particularly of the genus Verongia (yellow candle sponges). It spends its life resting on the surface or inside the tubes of these hosts.

Taxonomy and Morphology: It belongs to the family Gobiidae and the genus Elacatinus (known as neon or cleaning gobies). It is a tiny fish, reaching a maximum total length of just 3.5-4 cm. It features a slender, cylindrical body with large eyes oriented slightly upward and fleshy lips adapted to pluck parasites and dead skin from the bodies of client fish. The pelvic fins are fused into a cup-shaped sucker disc that allows it to cling to the slimy surface of host sponges.

Social Behavior: This goby is peaceful, active during the day, and beneficial to the aquarium community. It lives singly or in stable pairs that establish a 'cleaning station' on or near their host sponge. They attract larger fish by performing rhythmic, undulating body movements; client fish (including large predators) approach and hover motionless, allowing the goby to inspect and clean them without harm. It shows no territorial aggression.

Coloration and Sexual Dimorphism: Its coloration is distinct and distinguishes it from other neon gobies: the body background is dark grey, brown, or blackish, marked by a bright yellow or golden line that starts at the snout, passes over the eyes, and ends abruptly just behind the head or above the pectoral fin (hence shortstripe), rather than running down the entire body length. There is no visible sexual dimorphism.

Aquarium Setup: Due to its tiny size, this goby is an ideal resident for nano-reef aquariums, with a minimum recommended volume of 30-40 liters. The setup should feature live rock arranged to create small crevices and, if possible, live or artificial tube sponges to simulate its natural habitat. It prefers weak to moderate water current and standard reef lighting.

Diet and Feeding: In the wild, its diet consists of ectoparasites (such as parasitic isopods and copepods) and mucus removed from client fish. In captivity, it acclimates easily to commercial foods: it readily accepts small frozen foods (such as cyclops, copepods, brine shrimp, and finely chopped mysis) and high-quality commercial dry micro-pellets or crushed flakes. Feeding once or twice daily is sufficient.

Water Quality: Requires stable and clean water parameters: temperature 23-26 °C, pH 8.1-8.4, specific gravity 1.020-1.025, and KH 8-12. Although it is a relatively hardy goby, it is sensitive to rapid changes in salinity and organic waste spikes (ammonia or nitrite). Small weekly partial water changes are recommended to maintain water stability.

Compatibility and Cohabitation: This goby is 100% reef-safe and harmless to corals, clams, and small invertebrates. It is an excellent tankmate for peaceful community fish of almost any size, including tangs, clownfish, and wrasses, which will benefit from its cleaning services. Avoid housing with large, mouth-oriented predators (like scorpionfish or large groupers) that might ignore its cleaning status and eat it.

Aquarium Breeding: Breeding in captivity is possible and has been documented. The pair deposits adhesive eggs inside a small crevice or hollow pipe, and the male fertilizes and guards the nest, fanning the eggs until they hatch (typically in 5-7 days). Rearing the pelagic larvae requires a separate setup and a constant supply of live rotifers for the first week.

Risks and Diseases: It is a hardy fish but has a relatively short lifespan in the aquarium, usually around 1-2 years. Primary risks include rapid temperature or salinity fluctuations, which can trigger parasitic infections. Ensure that the goby is actively feeding on introduced foods and not relying solely on parasites, which may be scarce in a clean aquarium.