I'm have a question concerning heating and plants. I'm wondering if a heater is really necessary for plant-keeping. I have a 10 gallon aquarium which I want to aquascape with many more plants. I currently don't have a heating system for the aquarium, but I'm wondering if I will need it. I will be adding an anubias plant, some Java Ferns, perhaps Water sprite or Hornwort. I live in the California Bay Area, which has very mild winters. Today would be a normal day, and the temp of the water is 64 degrees F. Btw, I have two Amazon sword plants which I had for more than two years, and nothing happened to them over the winters, so I'm guessing it would be okay for the other plants as well. What's your guys' opinion? Thanks a lot!