Yellow Christmas Cactus

It seems that my yellow Christmas Cactus has some sort of bug infestation. It is logical to assume that my other ones are also infested. All the plants came from the same location and when they were brought home they were kept in close proximity. Also while I was cleaning the leaves one cracked at the base of the plant. When I lightly moved the plant to get a better look, the stem came out with ease and looked slimy and yellowish brown. It was nasty. I assume there is some root rot and I need to transplant and even cut off some roots. I am looking around to see what I can use to kill and eggs of these bugs. I hope I can save it as it is the only yellow Christmas Cactus I have.