Knowing your location would help. Morning sun in Maine or Michigan is far different than morning sun in Mexico or Southern California. They don't like direct sunlight so should be fine indoors with bright diffused light. They don't like to be chilly or sit in a drafty area. (I almost killed one of mine by setting it too close to a cold, drafty window). Are you keeping the humidity levels up? Anthuriums benefit from regular doses of fertilizer; how often are you fertilizing? Sorry for too many questions.
