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These two thorny plants are not suitable for indoor storage except in a place where they are blocked.
It depends on where you put your computer in the living room, and you have a basin next to it, and if it's not, you'd better not put it there.
OK. But you should often take it out to bask in the sun, at least there should be strong scattered light often. Otherwise, it will grow poorly and even die.
Not good, cacti are generally placed on the balcony in a bright and ventilated place is better, light and drought tolerant, it doesn't matter if the soil is dry, especially drought-tolerant and less watering and afraid of waterlogging.
Yes, cacti are adaptable, can absorb toxic and harmful substances in the air, and also absorb carbon dioxide at night to release oxygen.