It wants constantly moist soil, like a fern. And of course, not too moist. What I learned to do for my bosses plant was to water often, but to barely let water escape the bottom, so the soil was moist but not soaking. I gave a small plant a quarter cup about twice a week. It was under fluorescent lights, the more light the more water. Brown leaves that are never yellow first would convince me of underwatering. Good luck, You picked a challenging plant.