Most of the time I cut the flower scapes off my d. spathulata but a couple of times I've let one scape grow. It forms lots of pretty pink buds but they have never opened into flowers. I wait a good while but then end up just cutting it off. What would cause the buds not to open? The spath is in a lighted tank about 70-72ºF and 80% humidity. Otherwise it looks happy and healthy. Lots of sparkly dew and red tentacles.