I wanted to get a heater for my Betta but his tank is a 3 gallon
one and the least wattage of heater I can get where I stay in is a 50 Watt
fully submersible one. So my question is will the 50 W heater be okay for a small 3 gallon tank? I would like the water temperature to stay around the 28 degree C mark in the 2-3 months of winter we have here in Kolkata, India. Rest of the year it's nice and warm.
Please shed some light so I can buy the 50 W heater if it'll work well with my 3 gallon tank.