As much sun as possible. My Schomburgkias spend the summer outside where they get full sun eccept from about noon till 2PM when they get dappled shade. Winters are spent on the south side of the greenhouse again very bright. They grew great and hopefully this year I see them flower. As for the ants, that would only be in their native country. Also the Schomburgkias with hollow pseudobulbs are now classified as Myrmocophelia.