: Extremely hardy "bulletproof" fish that are often used to start new tanks. Key Equipment for a Subtropical Tank
(e.g., Hong Kong Pleco): Unique, flat-bodied fish that use suckers to stick to rocks. They require high oxygen levels and cooler water to survive long-term.
: Colorful, hardy livebearers that actually do better at subtropical temperatures than standard tropical ones.
: Large, active barbs with a metallic sheen; they are peaceful and can even be kept with goldfish in large enough tanks.
: Robust, attractive labyrinth fish related to bettas. They are adaptable but males can be aggressive toward each other.
When looking to buy, consider these common species known for their adaptability to cooler waters:
Buying —species that thrive in water temperatures between temperate and tropical (typically 64°F to 72°F)—is an increasingly popular choice for aquarists seeking hardy, energy-efficient setups. Because these fish often live in centrally heated homes without a heater, they are relatively inexpensive to maintain. Popular Subtropical Fish Species