Never feed a sick plant, never exceed the recommended strength of a fertilizer, and never feed a plant that is dormant. They also grow very tall, very fast, often reaching 6 or 7 feet in height. You can cut off the top half and put it in fresh material if if becomes too scraggly. Choose a time when new roots are growing and old roots are branching. Leave enough roots and leaves on each section.
Most growers remove and repot keikis after potting, water sparingly until new roots take hold.
Give additional light during active growth, up to 10,000 adtl lux for 3-4 hours. Southern or Southeastern exposure, greater than 3000 foot candles. If bloom is reluctant, increase light. Water abundantly only during active growth period. After bloom, reduce water for several weeks, but don t allow pseudobulbs to shrivel.