Just spent some quality time with my new A. Ornatum while repotting him in a more fitting non-organic medium. The solid block of peat moss around the roots would have made it impossible to properly water him.
It took half an hour (and 3 spines up my nails) to remove the soil, but the finished result was definitely worth it.
Current medium: 70% moler clay and 30% 3-4 mm. aquarium gravel.