Hey y'all! I know this question is probably been asked before, but I just want some clarification. I currently have a betta in a 10 gallon tank and I am upgrading him to a 20 gallon long. I have a 50 watt preset aqueon heater that I've had for a while in the 10 gallon and works great. I just want to make sure that it will properly heat all 20 gallons. I'd really like to not buy another heater unless I absolutely have to since they are always crazy expensive. And yes $30 is crazy expensive for me. Not everyone can afford that LOL. Thanks in advance for all the responses!