Looks correct. Thanks buddy.

Please help me identify this plant. Haven't seen a pic of an identical one in any searches related to caralluma, but it looks like one. It has triangular cross section.

Can I move now move it to shade right away, or should this be done gradually too ?

Its just been 20 days that I got this Mammilaria (pic attached) from a plant exhibit. I potted the plant myself and it looked good then - mostly green with tinges of purple on tips. Its has now turned mostly purple and I see grey/white spots developing on areoles. Is that sunburn or a pest? I placed...