Cory says the more wattage, more failure.
I just setup a new 88 gallon. It came with a cheap fluval m series 300. I decided to put my new in box 100 watt coop heater in.
Ambient 70, filled at at 72. Within 5 hours I had it at setpoint 77 and I haven't seen the heater on in days. Granted my glass is 10mm and it has a tight lid.
I'm of the school of more wattage only cooks fish faster school of thought.
Also, I have an inkbird on it. Just in case.