Becca, I get this mold all the time in my tank. Some mounts are more prone to this than others. I spray the mounts every day with Physan 20 and cut the shelf-fungus like stuff off with an Xacto knife or my thumnail. Eventually it goes away. It seems to have come in with one of the mounts and spread to several others. It really doesn't seem to hurt the plant but I don't like it anyways.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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