+1. Don't play about with the pH unless it is something well out of their comfort zone to being with (like 4 or 9).
I agree with Aus - you are going to need to put that heater in. It won't hurt him and it will keep the temperature stable.
It will automatically switch off if things are getting too warm. Just keep an eye on the temperature, though - they don't always give the temperature they are set to. For instance, I set one of my heaters to about 85 to get a temp of 80.
I agree with Aus - you are going to need to put that heater in. It won't hurt him and it will keep the temperature stable.