AQUASMITH Aquarium Heater,300W Fish Tank Heater,Suitable for 60-90 Gallon Fish Tank,Dual-chip Intelligent Temperature Control,Has a Variety of Intelligent Security Protection FunctionsBrand: AQUASMITH Features: Efficient heat transfer, durable & safeThe aquarium heaters acts as a durable tank "guardian," saving you from frequent replacements. Featuring rare quartz sand filling that doubles thermal conductivity, along with a nickel chromium heating wire and explosion proof quartz glass tube, it offers superior corrosion resistance and safety for extended, reliable use. The high temperature resistant ABS housing remains safe to touch