To encourage bloom, provide a high-phosphorus liquid fertilizer diluted to half strength every two weeks. These plants appreciate the use of a humidity tray. Cold water causes leaf spots, so if you're watering from the top, make sure the water is warm. Keep the soil damp during the growing season, irrigating with tepid water. Apply a high-phosphorus fertilizer once a month from the end of the plant's flowering period until the foliage dies down.
Fluorescent lighting is beneficial too.