Thanks, Poweramp for your input. That reminds me to flush my pots more often because I do get quite a bit of mineral build-up.
The following N. campanulata is doing well and pitchering at my balcony in LFS. Currently, the crazy weather is welcomed by this species...very bright one moment then followed by the rain. Not trying to contradict my own thread about the use of burnt earth but just want to highlight that N. campanulata is able to do well in LFS and perlite too when weather conditions are favourable.