I have 100 watts because I plan to grow my Neocaridina shrimp to 20 gallons in the coming months but I also needed a heater for their 3.5 gallon tank as it allows them to got too cold at night. Sure it's a bit long, I wish they had suggested a smaller size, but after digging into the substrate it fits. It takes approximately 24 hours for the heater to equalize the temperature throughout the tank.
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