This is actually a jungle tree dwelling cactus as opposed to a desert one so they prefer dappled light and humidity. Repotting can be done at the end of March. After flowering, allow them to have a rest period by reducing watering and move to a cooler room. They can get mealy so treat with methylated spirit if necessary. If the stems shrivel this can be due to over or under watering; if the stems scorch then this is due to too much heat or light.
Mist regularly or use a pebble tray.
Semi shade to bright sunny spot but indirect light. During the summer months, they can be placed outside in a shady spot to encourage new growth and flowering.
Minimum 10 degrees C