Posted: 11/11/2017 at 14:50
Too little water is not going to be a problem for cacti.
Too little light is often a problem for cacti.
Too much water is always a problem, particularly if the temperatures are low.
Simple care for cacti is don't water in the winter .........at all.
In the summer give it a good soaking and then leave to drain. Repeat just once or twice in the summer.
If indoors give it as much light as you without allowing it to burn in scorching sunlight.