Got the ducks winter tank set up. Used one of those 40 gallon stock tanks like this one here: And picked up one of those sinking tank de-icers with the metal cage around it, so it will stay thawed for the colder days (most now a days). My only concern is that the heater takes up some space. It's about 8 inches tall, and easily a foot or more around. this is the de-icer: http://www.google.com/products/cata...log_result&ct=image&resnum=4&ved=0CD8Q8gIwAw# So does anyone else use these? Have you had any problems with ducks getting hurt on them? I'm just worried about their feet, or them diving down onto it. I'm sure I'm probably just worrying for nothing, but felt better asking!