I've tried a few small heaters at local pet stores and no choice. Nothing lasted more than a few months. They are used in 3.5g betta tanks and I have had fish for decades. not an expert, but I would never let a heater run empty, for example. Anyway I got them after two heaters went out and the poor fish got cold. For a short time I wrapped the tanks in blankets with hand warmers. A few hours after these heaters were turned on, the rooster perked up and came out of hiding. Since then he has built a giant bubble nest! I can't say how long they will last, but I really like that it has an indicator so I can keep an eye on it. The suction cups are small so I didn't have much trouble attaching them to a round aquarium. FYI I have 1 in a rooster fish tank and another in a 5.5g community tank. Both tanks stay at the same temperature
Accumulative electric water heater Thermex Ceramik 50 V, white
11 Review
Convector Electrolux ECH/T-2000 M, white
21 Review
Faucet water heater with display
13 Review
Hardy Leaf Black Forest Asian Java Fern Potted Live Water Aquatic Aquarium Plants For Freshwater Fish Tank By Greenpro Microsorum Pteropus
39 Review
Efficient 2-In-1 Magnetic Fish Tank Cleaner With Non-Slip Design And Scratch-Free Blades
37 Review
Steam cleaner Deerma Deerma DEM-ZQ610 EU, white/red
68 Review
Mini pump Xiaomi Mijia Electric Pump 1S, plastic, black
55 Review
Jasonwell Magnetic Aquarium Fish Tank Glass Algae Cleaner - Floating Brush (L Size)
37 Review