I bought 4 Moth orchids all at the same time from Walmart, about a week later the flowers and the buds starting falling off on all of them. So I quickly went to google and read about them. They were planted in very dense moss except for one that has tiny bark pieces. So i carefully removed as much moss as i could around the main stem part of the plant, It was dry outside, but damp inside. Three seem fine but one is dying, what should i use as preventive to protect the others and maybe save this one as well? I have 3% hydrogen peroxide, 70% rubbing alcohol, and chlorhexidine cleaning solution 2%. I moved the sick one away and they have airflow from a fan and light from ceiling and window a few feet away. I cut right under the dead flowers to remove them with clean scissor. Thank you for any help.