Threadfin Funky GobyThreadfin Funky Goby (Sicyopterus longifilis) is a specialized algae-grazing hillstream goby closely related to Stiphodon. Males develop extraordinary elongated threadfin extensions on the dorsal fin — long, trailing filaments that add to an already dramatic fish. The body displays complex banding with red, orange, and dark markings. Like all Sicydiinae gobies, it is an amphidromous species with a life cycle that requires marine conditions for larval development — captive breeding is not possible. Wild-caught specimens require established algae growth and pristine, well-oxygenated water.Feeding & Care Tip: Live algae and biofilm on rocks and glass are the primary food source — established algae growth is essential before adding this fish. Supplement with Hikari Mini Algae Wafers placed on rocks and blanched vegetables. Hikari Frozen or Freeze-Dried Baby Brine Shrimp very sparingly.⚠ Algae Requirement: Like Otocinclus catfish, Stiphodon gobies are specialized algae and biofilm grazers that cannot survive without established live algae growing on rocks, glass, and hardscape. A tank without significant algae and biofilm growth will not sustain these fish regardless of supplemental feeding. Allow algae to establish thoroughly before adding Stiphodon. Hikari Mini Algae Wafers placed directly on rocks supplement but do not replace live algae growth. Blanched zucchini or spinach on rocks provides additional plant matter.Stiphodon gobies inhabit clear, fast-flowing, well-oxygenated hillstreams with rocky substrate covered in algae and biofilm. The aquarium should replicate these conditions: strong filtration, good water movement, rocky substrate and hardscape with established algae growth, and pristine water quality. These fish are sensitive to elevated nitrates and should never be added to immature aquariums. Males are territorial with each other but peaceful with other species.Note on Breeding: Stiphodon gobies have an amphidromous life cycle — adults live and spawn in freshwater streams, but the newly hatched larvae drift downstream to the ocean where they spend the first weeks developing in marine conditions before migrating back upstream into fresh water. This remarkable journey sometimes involves climbing waterfalls using their modified pelvic fins as suction cups. Captive breeding is not possible due to this marine larval stage.A specialist fish for the hillstream goby enthusiast. All Sicydiinae gobies share the same fundamental requirements: pristine water, strong oxygenation, established algae growth, and a tight-fitting lid. Within these parameters they are rewarding and often spectacular fish.Care & Ideal Parameters Difficulty Moderate Temperament Peaceful — males territorial with each other Typical Adult Size 3.0 inches (7.5 cm) Min. Group Size 1 male to 2+ females Ideal Temp 72–82°F (22–28°C) Ideal pH 7.0–8.0 Ideal GH 4–15 dGH Ideal KH 2–8 dKH Staple Food Live algae and biofilm (on rocks and glass); Hikari Mini Algae Wafers placed on rocks Treat / Supplement Blanched zucchini or spinach placed on rocks; Hikari Frozen or Freeze-Dried Baby Brine Shrimp very sparingly Origin Philippines and western Pacific island streams Notes Males develop dramatic elongated dorsal fin threadfins. Amphidromous. Larger than Stiphodon — give more territory. Stiphodon gobies are expert climbers — a tight-fitting lid is essential.
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