Peacock bass have lived a double life. In the wild and in stocked lakes across Florida and Texas, they're a freshwater gamefish prized by anglers for their fight. In the aquarium hobby, they were historically written off as too large and too aggressive for anything but a public aquarium. That's changing as more keepers build the genuinely large setups these fish need and treat them as the serious centerpiece species they are.
Cichla, the genus, includes around 15 species, ranging from the relatively manageable Cichla orinocensis (topping out around 20 inches in captivity) to the genuinely massive Cichla temensis, which can exceed 30 inches. Know which species you're buying. A juvenile peacock bass at 3 inches gives almost no visual indication of its adult size, and undersized tanks are the single biggest welfare problem in the peacock bass side of the hobby.
For Cichla orinocensis or Cichla ocellaris, the more commonly available species, plan for a minimum of 180 gallons at full adult size, with 300+ gallons being a more honest minimum for keeping a fish that active and that large long-term. These are powerful swimmers that need real linear distance, not just water volume. A tall, narrow tank wastes the space a peacock bass actually needs.
Water parameters are forgiving relative to other Amazonian cichlids. Temperature 75 to 82°F, pH 6.0 to 7.5, moderate hardness tolerated. The forgiveness ends with water quality maintenance. These are large, heavy-feeding predatory fish producing a serious bioload. Filtration needs to be oversized, not just adequate, and weekly 30 to 40% water changes aren't optional once the fish reaches adult size.
Diet is straightforward but easy to get wrong. Peacock bass are piscivores in the wild, but a diet of exclusively feeder fish carries real disease and nutritional deficiency risk over time. Build the diet around high-quality pellets formulated for large predatory fish, supplemented with whole prey items like silversides, shrimp, and occasional feeder fish from a quarantined, disease-free source. Avoid feeder goldfish as a primary food source; thiaminase in goldfish breaks down thiamine and causes long-term deficiency in fish fed them regularly.
Tankmates require real planning. Peacock bass are not community fish in any conventional sense, but in a sufficiently large tank, robust, similarly-sized South American cichlids like large geophagus species, silver dollars, and armored catfish like pleco species too large to be seen as prey can coexist. Anything that fits in a peacock bass's mouth will eventually become a meal regardless of temperament.
What's changed in the hobby is access to information and a generation of keepers building genuinely appropriate tanks instead of attempting these fish in undersized setups and being surprised when it goes badly. A peacock bass kept correctly, in the volume of water it actually needs, is one of the most rewarding large fish in the freshwater hobby: intelligent, interactive, and capable of recognizing its keeper in a way few other fish manage.
