Just a couple of sides notes:
- You can use cuttings to make several cactuses.
- It looks like you are growing it the same way you would weed. From what I understand, not only is this unnecessary, but you might end up harming the cactus. Take a look into it
Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming "Wow! What a Ride!”
― Hunter S. Thompson