Hi there I am new to growing and cutting clones. I need some help my clones are turning dark and mushy on the tops (rotting I think) and on the leaves close to where the tops would be. Here is the info on my situation - The clones are in rockwool, we used powdered sim root, the room is kept at 27-29c (inside of the trays is a similar temp), the humidity inside of the trays is between 70-80%, there is no moisture inside of the trays and we are using a fluorescent light. Any help would be greatly appreciated.