The term "4" Clown Knife" likely refers to the Clown Knife Fish (Chitala ornata), a popular and distinctive freshwater fish known for its knife-shaped body and attractive markings. Here are some details:
 
Specifications:
Average Size: Clown Knife Fish can grow quite large. The size mentioned, 4 inches, likely indicates the size of the individual being offered.
 
Characteristics:
Distinctive knife-shaped body.
Silver with black or dark markings, resembling clown patterns.
 
Habitat:
Native to Southeast Asia, Clown Knife Fish are often found in slow-moving waters, rivers, and floodplains.
 
Behavior:
Generally peaceful, but as they grow, they may become predatory and may eat smaller fish. They are best kept with larger tankmates.
 
Tank Size:
Given their potential size, a large aquarium is necessary. A tank size of several hundred gallons may be needed as they grow.
 
Care Level:
Requires a well-maintained aquarium with clean water. Ammonia and nitrite levels should be kept at zero.
 
Diet:
Carnivorous. They prefer live or frozen foods like fish, shrimp, and other meaty offerings.
 
Water Parameters:
pH: 6.5-7.5
Temperature: 75-82°F
Hardness: 5-20 dGH
 
Disclaimer: "Please note that these are general guidelines, and for more accurate values or specific care requirements, we encourage you to contact Living Aquarium by phone or in person. Within store hours, our team of experts is always happy to answer any questions you may have and provide personalized guidance on care."