I have an orchid plant approx. 10-12" tall purchased about two weeks ago. I have watered the plant twice and after the first time I noticed black leaves that had fallen off. I changed the pot and bark, cut off the black and used cinnamon on the new cuts and read the cure for fungus was peroxide, lysterine, or fungicide. I used peroxide, cinnamon, and have just used fungicide on the plant. When I used the fungicide today I notice more black leaves had fallen off. Can anyone help? Thanks.