I'm one of the few who advocates pine for rodents. However its not the wal-mart pine. You need to get a pine that is designed for horses, kiln dried and sifted.
I have about 500 mice on pine (the type I described above). They dont smell until the 6th day or unless their drinking valves leak.
Aquariums have really poor airflow. They are designed to hold in liquid so the ammonia has a hard time evaporating. You can try setting a fan to blow lightly over the top of the tank to increase airflow. It will stink worse for a few hours but should mellow out. Also a window open in the room will help to dissipate the ammonia/musk smell.
Bryan