I leave the electric blankets on low. You may not need them.

Ya those pots look like hard plastic. That stuff is tuff to cut through most definatly.

What are signs of under watering that you are getting. I have seen a couple of my plants wilt from lack of water which goes from health to death in say 12 hours, totally dry. But thats about it. Usually in normal conditions they can go up to 24 hours being bone dry.