I probably am not much help here, but it just kills me to throw away a plant that still has some life in it. That's just me. Since I have so many orchids, keeping these "struggling" ones is not a big thing to me. I have everything from tiny seedlings (what I call my "baby" ones) to mature, blooming size ones, so I always have some that aren't doing well. For me, keeping those baby ones going is the real chore. Those tiny ones are a challenge and those are the ones that I know I will lose some of.
