Ang. distichum rotted in my terrarium

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It had been doing extremely well for a couple of years. I recently cleaned out the terrarium and reestablished the plants. There's a Pleurothallis truncata above the Angraecum, so I didn't notice the base of the plant had rotted away. I did, however, notice the brown leaves and dramatic leaf drop. I pulled the plant out and cut off what I thought was salvageable. The cuttings are in a 3% H2O2 solution. Is there any way of saving the cuttings? What to do to get some root mass on the cuttings? What should be done with the terrarium, in that a diseased plant was among the healthy ones and I don't want this to spread? Thanks. Pics below.