Fertilizing cacti in summer

Tell me, do I need to feed cacti in the summer? It’s hot now, they’re kind of shriveled and yellowed... Maybe I should feed them with calcium? Or just water more often and wait for the heat to end?

I can feed cacti only during flowering and only with organic fertilizer such as vermicompost or water them with mineral water from a spring. In the hot season, it is worth increasing watering.

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