Need help from cactus expert!!?

Cactuses are not fond of being cut in half. A cactus is referred to as a

succulent plant. They take up and hold water. That is how they survive

in the desert. The gooey substance you see inside the plant is very

normal. Wow, normally I would just say to throw the cactus away

because it shouldn't have been cut. What you could try is this; if the

part you want to keep has any roots on it at all, or even if it doesn't,

buy some potting soil and add a lot of sand to it because cactuses

grow in sand. Plant the part you want to try and save into that soil/

sand mixture. Give it a LITTLE drink of water. Sit it near a window

but not in direct sun. Hope for the best. I will be honest, I don't have

a lot of hope that it will survive because its inside is exposed, but

give it a try. Just so you know, cactuses need their soil to dry right

out pretty well before you water them again. The fact that your

cactus developed mold tells me you were keeping it too wet. The

part that you are trying to save, keep it slightly damp but not wet.

I hope it lives.

The mold means you over watered it. If your cactus survives, it will have a brown crust on top of it.