oh I also forot to mention something about the mold. If the plant is doing fine don't worry about it. If its salt buld up the worry. Make sure you leach your potws regularly toprevent this. Once a month is good. I personaly don't fertalize like I should so my pots are leached every time I water unless I fertalize. LOL My cattleya alliance I have in sphag has all kind of algea growing on it. Orchids have a symbiotic relationship with fungus and things so unless the plant is suffering then it should be fine. If your worried get some pysan 20 and water with it the next 2 or 3 times it should kill the fungus. I think the dose is 2 table spoons per gallon. It should say the dose for orchids.