Please help me identify this problem on my moon cactus!
I have dug up the soil a little this morning and I noticed there was this brown color on the base of my cactus. I was thinking it could be overwatering. However, it did not feel soft and mushy when I touched it. When I hold it up to the light, I could see that the inside of the cactus near the brown color is not opaque. It shows a light green color when I hold it up to the light. Is this something to be worried about?