Seedlings:what soil do you use for you seedlings and adult?
25% Zeorite- 1mm size ( Zeorite is crashed permeable rock)
25% Clay grain- 1mm size
25% Coarse sand- 1mm size
25% Organic materias (Seed rising potting-mix for normal plant)
Adult Ariocarpus
60% Pumice sand- 2~4mm size
40% Organic material (Catus-mix in shop)
I use above mix for my cacti including Ariocarpus.
Frank