I got this from a grower who sold me some Tolumnias when she spoke at my orchid society last month. I hope it helps.
Temperature: Intermediate, 55-90 degrees Fahrenheit. Try to keep below 95 degrees in the summer. Can be grown outdoors as long as night temperatures are above 55 degrees.Cheers,
Light: Bright, diffused. Brigh, dappled shade outdoors. East or South window indoors. Be sure to protect plants from direct sun during the heat of the day.
Water: Mounted plants should be watered daily in summer; once or twice a week in winter. Potted plants should be allowed to dry out between waterings but should be misted daily. Water or mist only on clear days.
Feeding: Use any good balanced fertillizer at half strength every two weeks. If waterings are frequent, cut to one-fourth strength and feed every third or fourth watering.
Repotting: Should be done when the plant has outgrown its slab or container, or when medium shows signs of breaking down. Plants on slabs can simply be attached, slab and all to a larger mount. If potted, move up to the next size pot. Use an open mix--equitants must have good air circulation around the roots to avoid rot.
Note: Do not cut the spike after initial flowering; it will often branch and bloom again.