I got a heater from a friend who bought a 29 gallon tank at Wal-Mart. It came with the heater in the picture. Anyone know whether it's submersible or not? It has a water line on the back, but it doesn't say whether it's a maximum or a minimum line.
Link to possibly helpful picture: http://img33.exs.cx/img33/8374/walmartheater9gr.jpg
Link to possibly helpful picture: http://img33.exs.cx/img33/8374/walmartheater9gr.jpg