Fungus on clones

A question from a fellow grower:

we have started some clones on july 3, we put dome on for humidty sake and purchased a heat pad to keep water warm. the problem we are havin they are rotting, what have we done wrong?

The water can not be too hot or the roots will die or not form, no much higher than 75F/24c, the more ideal range being about 70F/21C and no lower than 60F/16C, obviously for cloning you do want it a bit warm so again it needs to be much much closer to the warm side of things. Also the humidity in the dome can not stay to high too long or have the plants be too wet too long/often. If cloning in a “bubbler” you might not need the humidity dome at all.