^this, cactus are almost always over watered, which causes them to rot from the inside out.put them in loose sandy soil and water them once a month. i water these two aloe plants on the first of the month every month, and leave them alone the rest of the month. they've doubled in size in less than a year, the star aloe is already throwing pups.Yeah, I would carefully replant each one in its own small container filled with a more cactus friendly substrate. leave the dirt on what little roots they have, just try and pry them each up like a small clump and replant in sandy cactus soil.
I am not a cactus doctor but it should help.