It is the oddest thing. The insides are turning to liquid, but the root systems are fine. I cut one open and found a tunnel, but nothing at the end of it, but the healthy, solid root. This is taking all of my barrels, one after another. I just lost a very nice ueblemania pectinifera. I have found that a colony of black ants has moved into one of the larger pots ( a none barrel cactus). Could these tiny creatures be the fiends that are killing my barrels? If they are I have a lot of work ahead. Can they do this or do you know what can. They are not over watered.