Greetings. I understand that media-based systems can take months or even years to mature properly. I live in the northeast and do not have the luxury of a heated area for a system. For my location, would a raft system be a better choice over a media-based system? Seems like the media system would just get going before cold weather arrives. Put simply, are raft systems better suited for locations that go below freezing each year? Does a raft system offer quicker start-up in the spring? Thanks!