@Knessler. I have suggested to have your question moved to the "Cactus" forum where you will probably get better response. By the way, please take a moment and go to your "Profile". Update your public profile by giving your location. City and state is best but even your USDA zone is better than nothing.
Also, you might tell us how these cacti are being grown. The more information you can give as to its care, the better.