I have this cactus that I had bought quite a while ago and I am still unsure of what species it is. I had changed its soil quite a few months ago and it seemed that quite a bit of the bottom of the cactus was too far under the soil. For a while it had also seemed pretty dehydrated. But now recently I went to change the soil again as all my cacti needed a soil change and I'm pretty sure I had a fungal issue going on as two of my cacti rotted and died. When I took this one out, I noticed that now the roots almost seem like they're starting to rot. They're discolored and somewhat mushy. I haven't put it in the soil yet since I wanted to wait for the soil to completely dry since it seems like this one could be rotting but I'm still not completely sure. I've never been very successful at saving cactus from rot by cutting them off from the rotted part but that's probably because many of those were too far gone. I really don't want to lose any more of my cacti so I need some help here.
