Well, good luck to you, troutredds! I, too, tried to keep them, but to no avail. I even thought when they died back, maybe they would come back from the great root system, but again, no luck. If you have success, please share it with us! Since you have quite a few, try different ways. Some say using an air bubbler and moving water on them helps them through the winter. All I know is mine did great in my insulated (not heated) garage, until I thought it was getting too cool, and moved them to the basement, which stays around 55 during the winter. They all died within a week. Same florescent light in both places, so really not sure what the change was.