Cultivated since many many years. It is now in a mix 50% bark/25% cubic rockwool/25% small pieces of white lava and a little charcoal. I feed it one time per week at 50 ppm N.
Yes this is red spiders. Clean the leaves with a mixture 70% iso-propyl alcohol/30% water. You will see a red color on the tissue used to clean the leaves. Repeat the cleaning one more time a week later.