Brown spot on the head of my moon cactus

My red moon cactus is getting a dark brown spot on it’s head. What should.i do? It is next to three other ones that look ok. Let me know if I should remove the red to protect the other cacti and succulents in terrainum.

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1 Comment To "Brown spot on the head of my moon cactus"

#1 Comment By Downtoearthdigs On 07/05/2018 @ 10:07 am

Once signs of fungus appear on Cactus it may be to late to stop or save them.
This article has more information.

https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/fungal-lesions-on-cactus.htm ^[1]

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