I think if you search the FAQs you may find your answers. But I will say the like humidity, Bright but not direct sunlight, and the dont like to drown but they also dont like to dry out. I would use regular repotting mix and but them in a inch arger pot than they are in now..

I don't see a FAQ's section for this forum.

D

Those sound very pretty! Like any plant in a pot, your Philos would appreciate a chunky, porous soil that can be moist yet still have some air in it. Water often enough that it doesn't wilt, which will probably vary depending on temps, seasons, which can speed/slow growth.

Agreed, the kind you describe sound like they wouldn't appreciate direct sunlight, Philos generally burn easily. Fertilize very weakly when actively growing. The size of the pot should be big enough that the plant isn't top-heavy, not in danger of tipping/blowing over easily, with enough room for roots to roam for a while.