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Bear in mind that you have to turn the lights off at night, and that will drop the temperature right back down. Fluctuations like that are really bad for fish.
I also wouldn't trust any thermometer other than one designed specifically for water, since they sometimes do give dodgy reading underwater.
Definitely get a 50watt heater when you can. Your 7.5 watt could easily explode or burn itself out from the strain of trying to heat that much water.
I also wouldn't trust any thermometer other than one designed specifically for water, since they sometimes do give dodgy reading underwater.
Definitely get a 50watt heater when you can. Your 7.5 watt could easily explode or burn itself out from the strain of trying to heat that much water.