I'm brand new to the forum and to succulents. I got this little guy about a week ago along with a couple others. Wanted to put them in a bigger pot but noticed some grey-ish spots on a few of the leaves on this little guy. It doesn't seem to be on any of the other plants or any of the other stalks of this one. Is it a problem? Do I need to keep it away from the other plants? Another pot or whole separate room? Thank you in advance for any advice you may have.