Skilletfish

Gobiesox strumosus, the Skilletfish, is a North American coastal native and a member of the clingfish family — not a blenny, despite the flat-headed bottom-hugging appearance. The distinguishing feature is a muscular suction disc formed from fused, modified pelvic fins that lets this fish lock onto rock, glass, and hard substrate with considerably more grip than its small size suggests. In the wild they occupy rocky intertidal and estuarine zones along the Atlantic coast, clamped against substrate in surge zones and picking off small crustaceans and invertebrates.

In a reef tank, they're genuinely reef-safe oddball fish: completely benign toward corals and most invertebrates, and well-behaved with fish they can't fit in their mouth. They hunt small crustaceans and amphipods, so ornamental shrimp smaller than about a half inch aren't fully safe — but snails, hermit crabs, and anything of meaningful size are unbothered. Most of their activity happens at odd hours; during the day they're typically parked on glass or rock using that suction disc, which is exactly where they're most entertaining to watch.

Feed frozen mysis, small meaty foods, or pieces of silversides. They're not aggressive surface feeders but will pick frozen off the bottom readily once settled in.

Scientific name: Gobiesox strumosus
Origin: Western Atlantic coast — estuaries, rocky intertidal zones, and brackish coastal habitats from New England to Florida
Water parameters: Temp 64–80°F · Salinity 1.020–1.025 · pH 8.1–8.4
Tank requirements: 20 gal minimum; prefers rock and rubble with vertical surfaces to cling to
Diet: Carnivore — frozen mysis, small meaty foods; picks prepared food off the bottom
Compatibility: Reef safe; peaceful with fish too large to eat; small shrimp at risk
Husbandry note: Acclimate slowly — these are estuarine fish tolerant of some salinity variation in the wild, but they need stable reef parameters in captivity. Keep the suction disc area free of sand for healthy adhesion to glass.