I purchased 2 night blooming lilies this year. They got a late start blooming but eventually did well. I wanted to keep them for next year and as they are tropical, I brought them in. I had them in a 30 gallon aquarium. I cut them back when I brought them in and they immediately started growing again. Now, 3 weeks later there are no leaves and the tubers are fuzzy and soft. Anybody have any idea what went wrong? I have wintered over tropicals this way before and never had a problem.