Hi. In order to have a large quantity of water available for water changes, people have mentioned using a large plastic trash barrel. I would like to keep the water warm--is there some type of heater that people commonly use? Also, do you need to have any other equipment for aging the water in the barrel? I am now using 25 one gallon plastic milk containers and thus I spend a lot of time warming each container before I put the water into my tanks. My fish and the water are in my basement and thus the aging water is really quite cold. I would appreciate any information on how to set up such a system. Thanks. Tom