Compact USB Aquarium Heater — 90 mm, for tanks up to 20 L Key benefits Stable 26°C environment: automatic temperature control holds a steady 26°C to reduce stress and support the health of tropical fish, shrimp, and other small aquatic pets. Spacesaving design: at just 90 mm long, the heater fits into small aquariums and fish bowls without taking up valuable swimming space. Clear safety and durability: hard glass construction with a threelayer waterproof design meeting IP68 standards for reliable, longterm use in water. What it does and why you need it Maintains a consistent, appropriate temperature for small tanks where ambient room temperature can fluctuate and harm sensitive species. Prevents temperature swings that can lead to illness, slow metabolism, or breeding problems. Compact form factor makes it possible to add effective heating to desktop tanks, quarantine containers, and small decorative bowls. Key features Size and compatibility: 90 mm length, designed specifically for aquariums up to 20 L (small tanks and fish bowls). Automatic temperature control: fixed 26°C setpoint for consistent, handsoff heating without manual adjustments. Construction and safety: hard glass body with a threelayer waterproof build; compliant with IP68 water ingress protection for safe submersion and use. USBpowered: designed as a USB heater for convenient power connection to standard USB ports. Practical use scenarios Desktop betta or small tropical fish tank: keeps a stable 26°C for singlespecies tanks on desks or shelves where room temperature varies. Quarantine or hospital tank: provides reliable, compact heating for shortterm treatment tanks without needing a fullsize heater. Shrimp or nanoplant tank and decorative bowls: small footprint allows placement in narrow or crowded setups while maintaining proper water temperature. Simple to integrate Small and unobtrusive design fits into tight spaces and leaves room for decorations and biological filtration. Intended for submersion and continuous use in smallvolume aquariums; the IP68rated waterproof design supports safe operation in water. Safety notes (keeps original specifications) Hard glass construction and threelayer waterproofing meet IP68 protection; follow normal aquarium safety and handling practices. Use in tanks up to 20 L as specified; ensure secure installation and stable power source. This compact USB heater provides a practical, reliable way to maintain 26°C in small aquariums and bowls, combining a minimal footprint with IP68rated waterproofing and hard glass construction for dependable performance.