By memory

I didn't take an initial photo, but it was just a very small seedling at the time.
It is very hardy and had no problems with a heavy root removal and cutting back.
It happily tolerates a heavier mix and will grow fast if given good levels of sun, although I still add washed river sand for drainage, just not as much so as to keep it with a higher level of water than other Mels I am growing.
My only tip is to not allow it to dry out. I had initially given it a slightly heavier mix - being that its natural habitat is a bit on the wetter side - and this proved beneficial as I once left it too long between waterings...but it thankfully bounced back.
You can watch an interesting video on it, as I hadn't realized it was critically endangered. I merely purchased it because I liked the look of it and the tiny foliage and weeping branches.
https://www.youtube.com/watch?v=wu0aWwHW2aQ
10 Jan 2022