Posted: 09/09/2015 at 08:43
Thank you everyone - yes, I have tried them in several different spots, but will try different room now.
i looked up orchid pests and problems online abd apparently longitudinal cracks can indicate under watering...they weren't watered whilst I was away for 2 weeks, but as some if you say my dad's ones thrive on neglect! He hardly ever feeds.
mind you, I used to never feed mine and barely water when they were flowering, but carried in never feeding and hardly watering when something changed.
they had flowered in exactly the sane locations too before.
I wish I could hand my last one to one if you, as a sort of plant hospital