I use a simple eheim glass heater with built in thermostat. I find it keeps the temperature in a 0.5 degree (f) range. I set it at 80 and I find my temperature anywhere from 79.8 to 80.3.
I also use an inkbird as an emergency shutoff in case the heater gets stuck on (I suppose it would also alarm if too cold but I don't care about that).
I also use an inkbird as an emergency shutoff in case the heater gets stuck on (I suppose it would also alarm if too cold but I don't care about that).