Night Blooming Cactus

Question

what is happening to this cactus, and how to fix? thanks

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Answer 1

I have answered this in the original question, but I'll add this- I would hold off in between watering until the soil is completely dry down to about an inch, to two inches between watering. That looks to be damage from overwatering.

You may, also, want to treat with a fungicide: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm