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This is the number one cause of death for cacti!
Giving cacti too much water can have two possible adverse affects - plants can be weakened and succomb to fungus attack, collapse and turn into a watery mess.
Giving too much water at the start of the season, after a dry resting period, can lead to splitting of the skin. (As can happen with tomatoes if watering is erratic) See photo on right.
Increase watering amount and frequency gradually after a period of rest.