Cactus help

I read your article on cactus rot and i believe thats whats going on.
Details: we purchased this cactus off someone a couple months ago, repotted and out it in out home and now Sits in a northwestern large window.
We made a mix of aprox 70% potting soil, 10% peat, 10%s and and some lava rock. Replanted and watered it with about 32oz of water the same week. The former owner had said it had been about 3 months from the last watering and usually gave it a gallon every other month. Here are pics from 2 months after we got it.
Whats should i do? Cut the rot? Repot in more sandy rocky conditions?
Ps. The ropes are not tight they are just in case until its roots are stable again.

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1 Comment To "Cactus help"

#1 Comment By Downtoearthdigs On 04/17/2017 @ 11:45 pm

The Cactus likely did not need repotting as they can live in the same pot for years.
They prefer the roots to be in a smaller compact area.
Too large of a pot can easily lead to overwatering and then root rot.

The soil that you plant your cactus in should be very specific to there nutrition and water needs.
A premix specifically made for cactus can be used or this link will help.
https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/cactus-potting-soil.htm ^[1]

Unfortunately when the cactus begins to display the soft and sunken areas on the plant, a tell tale sign of root rot, it may be too late to repot and change the soil mix.

https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/cacti-succulents-inside-your-home.htm ^[2]
https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/cactus-going-soft.htm ^[3]

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[2] https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/cacti-succulents-inside-your-home.htm: https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/cacti-succulents-inside-your-home.htm

[3] https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/cactus-going-soft.htm: https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/cactus-going-soft.htm

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