Hitop 25W/50W/100W/300W Adjustable Aquarium Heater, Submersible Glass Water Heater for 5 – 70 Gallon Fish Tank (300W)Brand: HITOP Fish Color: blue Features: Wide Application: 300W aquarium heater, length: 11*1*1 in (27*2. 5*2. 5 cm), suitable for 35 70 gallon aquariums, also suitable for seawater and freshwater, can be used in fish tanks and turtle tanks. Safe: Explosion proof glass heater, this fish tank heater is made of 2mm thickened quartz glass, 33% thicker than ordinary glass, not easy to crack, which is very safe for people and aquatic animals. Adjustable