Question
how do you care of a cactus you keep inside your house?

Answer
Dear Leslie,

I don't. I don't keep any cactus inside the house because they won't get enough light. They need at least 15 hours of very bright light per day to grow well. If I did, I would use a grow light to supplement the light coming into the house. Make sure that the soil drues out before watering. Thats about it.

Sincerely,

Greg