heater help

I've been looking up heaters but I'm having trouble finding a balance. Could someone help me to know what heater to use? I have a 29 gallon tank and I only need an 100 watt heater. But my problem is I want a good heater ; one that will work and be reliable, but I also want to not spend alot of...

Exactly as it sounds. I meant to get a 100 or 150 watt. But will the 200 watt work all the same?

My heater is about 2 months old & is looking strange at the bottom. I'm uploading a pic. Does anyone know what this is about & if I need a new one already?? Ughhh

Hey guys! Brand new to the page, my betta fish got a new heater and its been at a steady 84 degrees Fahrenheit and that's a little warm for my comfort so my questions are 1. do you think this heat is okay? 2. If not, is it okay for me to turn it off for a couple of hours and then turn it back on?

I recently done a water change for my 40gallon fish tank, however I accidently forgot to turn off the heater, when I noticed I quickly switched it off though it wasnt out of water for too long. When the tank was filled back up, I plugged in the heater and two days later it is making a loud...