I have a Dendrobium Bigibbum that flowered a few months ago. I pruned back the spent flower stalks no problem and it is preparing to flower again but I have a few issues. Basically, the two main stalks (if that is the right word) as you can see from the picture don't seem to be as plump or as fresh as they should be. The leaves are also a yellowy green. I am wondering if some pruning needs to be done again after flowering. I water it once a week with a half strength fertiliser (Baby Bio) but I'm not sure if that is sufficient. I would appreciate any input that people can throw my way. I really want my plant to flourish.