Black Sailfin Blenny

Black Sailfin Blenny ([Atrosalarias fuscus]) is a peaceful species that is reef-safe with caution, admired for its striking black coloration, large sail-like dorsal fin, algae-grazing habits, and active personality.

Males typically display a taller, more pronounced dorsal fin and deeper body coloration, while females/juveniles are slightly smaller with less prominent dorsal fins and lighter coloration.

They reach about 3–4 inches and should be housed in aquariums of at least 30 gallons. Provide live rock with plenty of algae growth, hiding spots, and open swimming space, stable water parameters (salinity ~1.020–1.025, temperature ~72–79°F, pH ~8.1–8.4), and a secure lid since many species are prone to jumping.

Diet should consist of algae, spirulina, mysis shrimp, brine shrimp, and high-quality marine pellets. With proper care, this fish makes a standout addition to the aquarium, offering both beauty and functional algae control.

International Aquatics Quarantine & Guarantee: All fish are checked by marine vets, given a formalin bath, and held for 14 days in copper-treated systems. We feed Selcon-soaked food with Kanaplex and Metroplex during quarantine. Unless marked, all livestock comes with our 15-Day Guarantee. You will receive a video of your fish eating before shipment. On request, we also send photos/videos after arrival at IA. Some species are import-to-order (3-10 business days). Many common species are already cleared or near the end of QT.

Several species will be import-to-order and may take anywhere from 3-10 business days to secure. Once your fish is secured, you will be notified, and the quarantine process will then begin.