I am a person who recently got a cactus from a previous owner (used as a decorative piece in a restaurant), and I also have 0 experience gardening. Some searches on stackexchange and elsewhere seem to tell me it's in rough shape, and I was wondering if (and how) I could mitigate these issues. If anyone else happens to know the breed it would be helpful as well.
First off, the cactus quickly becomes quite deformed and skinny, and it has severely grown to one side since I first saw it a year ago: I am under the impression that the bending is a phototropic response, and so can be corrected.
The bending is on the same side as a waxy purple splotch. Similar posts on this site have led me to believe it's being undernourished, overwatered, or sunburned. The previous owners were informally waiting for it to die, I don't know if it's been watered in months. This is one of the things I am most concerned about if it will lead to the cactus dying if its diseased or something.
Furthermore, the glass I got it in seems to be covered in a green splotches, and I don't know if this is the glass or if something on the plant is dying and causing this and it's just visible from the places I am seeing the plant.
The last concern about saving it, is that it seems to be growing wider again in the past few months (before I owned it) and I am concerned that there are going to be structural failures if I can resuscitate it.
In summary, I was wondering what this critter is and if there is a way to save it (if it needs saving)?