We need to summon lepetitmartien to this thread, he is a lover of all things vanilla...
Hey!! Little Martian!!
Too late, I've already taken power of this thread, mwahahahaha
The substrate should do, it's more the traditional used in Europe. Myself I've switched to a mix coco chips based with enough other things to aerate. (coco/bark/cork/leca/perlite)