I am at a loss and need some ideas. I have propagated plants for years in water. I never used anything but water. And I wasn't the best at changing the water. I could go a week before I changed. Everything did fine. I've kept plants in water for months or more because I liked the look and it was easy. Now, for the last 4-5 months my propagations just rot and the water is a mess within days. I can not figure out what has changed! Help!