Help please, Stapelia.. no environment changes what so ever. No pests. Water when dry. Under light 12 hours daily since day 1. Has been in a mix of bonsai jacks gritty mix 80%, coco coir 10%, worm castings 10%. I've had this baby since July and just now over the last 2 weeks its been turning yellow. I took it out of the pot today to check roots, they're beautiful! Like I said, no changes since day 1. The yellow parts are just as firm as the green. What is going on??
