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Thank you very much @nikv! I am constantly looking for information on the Internet, so sometimes when they are similar, I can be wrong. I also had a Zebra, white spots are bigger, but I thought this was a subspecies.

IMG_6497.jpg
You remember this little cactus that I treated with insecticide. How does it look to you now?
https://peakd.com/hive-183841/@desro/a-few-cacti-that-survived

 8 months ago  

Definitely on the way back to health. Good job!

Thanks to you, I didn't even notice that anything was wrong.