I'm getting ready to finally set up my 140 gallon ACRYLIC tank. I've never had an acrylic tank before and I'm not sure if that makes a difference in what kind of heater I use. Can heaters melt the acrylic? What watt heater do I need for 140 gallons? The dimensions are 48x26x26. Is it better to use two heaters? One on each side? What do you guys have in your similar sized set ups? The tank will be home to ca/sa cichlids.