Neobenthamia Gracilis challenges

[Fredmax]

Has anyone else had troubles growing this? I'm now watching my third attempt at growing it slowly yellow one leaf at a time.

My climate is similar to California/Mediterranean with low humidity & 5c-35c, I understand this plant prefers high sun but can only assume the rapid leaf yellowing is a result of insufficient humidity and not light related, I'm keeping it on the moist side though may try letting it dry out in case that's it. My first plant made it through most of winter so assume it can handle lowish temperatures ok?

I've heard this was easy to grow for many, if anyone knows the secret please share . My plant will appreciate it.