Is my moon cactus rotting ? :/
This is my first time planting a moon cactus and it was given to me around 2 months ago... Initially I placed my cactus under direct sunlight after watering but then I transferred it to another window with no direct sunlight but in the morning it's still v bright. Now I have realised that the top part of the moon cactus is getting kinda black and i am worried that I might not be able to save it... :( Could it be me overwatering it or did I do anything wrong? Pls advise and thanks in advance !