My cactus can't hold itself up anymore
Hello. Does anyone know what is happening to this cactus? It seems to be growing too fast and isn't able to support itself anymore. It is in an east facing window, also with plenty of south light. I turn it frequently so one side doesn't get too much direct sun. When I repotted it about 2 years ago the main root was at a 45 degree angle, I couldn't straighten it out, but it seems healthy. Could it be the soil? I used a general cactus mixture. Also, could anyone give a specific ID to it? Thank you.