Blue Spot Grouper (Cephalopholis argus)

The Blue Spot Grouper, also known as the Peacock Hind, Argus Grouper, or simply Blue‑Spotted Grouper, is a beautifully patterned marine predator that makes a dramatic and engaging addition to a large saltwater aquarium. Its body is typically adorned with vivid blue spots on a darker brown or greenish base, creating a stunning contrast that brings reef environments to life. 

Description:

This grouper features a robust, muscular build with striking blue spotting across its body that may fade or shift slightly as the fish matures. Juveniles and adults can differ in pattern and colour intensity, but both life stages are eye‑catching. Active but secretive, the Blue Spot Grouper often hides among rockwork and caves until feeding time when it boldly ventures out. 

Key Features:

• Striking Appearance: Bright blue spots against a darker body — a standout visual in large aquariums.  
• Carnivorous Predator: Feeds on meaty foods like shrimp, fish, and crustaceans.  
• Semi‑Aggressive / Territorial: May eat or harass smaller fish and invertebrates; best with larger tank mates.  
• Not Reef‑Safe: Can prey on smaller tank inhabitants.  
• Enjoys caves, overhangs, and sandy areas for hiding and ambush.  

Care Level:

Intermediate — requires stable water quality and a mature aquarium setup. 

Diet:

Carnivore — enriched frozen foods, shrimp, small fish, and other meaty items. 

Minimum Tank Size:

Large systems (ideally 300+ L / ~80+ gal) with plenty of space and hiding spots. 

Temperament:

Semi‑aggressive / territorial — best kept singly with larger, robust tankmates.