Description
A stocky, bottom-dwelling fish with a broad, flattened head, thick lips, and mottled brown/olive camouflage pattern. It has a very “rock-like” appearance and blends into rubble, oyster beds, and rocky bottoms. Known for its loud croaking or grunting sounds, especially during territorial displays.
Lighting
Low to moderate lighting
(Prefers dim, shaded environments and avoids bright exposure)
Placement (Aquarium Zone)
Lower reef / benthic zone
Stays on or under substrate, inside caves, or among rockwork
Temperature
18–24°C (64–75°F)
(Cooler-water species compared to most tropical reef fish)
Salinity
1.020–1.025 SG
(Tolerates brackish to full marine conditions depending on origin)
pH
7.8–8.3
Alkalinity
8–12 dKH
Diet
Carnivore (ambush feeder)
Shrimp
Crabs
Small fish
Mollusks
Frozen meaty marine foods
Adult Size (up to)
~30–38 cm (12–15 inches)
Care Level
Intermediate
(Hardy but highly predatory and space-specific needs)
Compatibility
Highly aggressive / predatory
Not reef-safe (will eat crustaceans, fish, and invertebrates)
Best kept alone or with large, robust fish only
Poor community tank candidate
Territorial and can ambush tankmates
