This was my first Sarc. I grew it successfully in a spagnum/bark mix (about 50/50) in small plastic pots for 6-7 years.
Then I attended a talk on Sarcs, by someone, who has grown Sarcs extremely well for 30+ years. He mentioned that ceciliae tends to suffer from SSDS (Sarc Sudden Death Syndrome) - in part because it hates getting repotted.
Within 30 days he was right.
Had you never heard that, you’d still have the plant!