Hm, that's good to hear at least. Are you sure it's algae though? To my layman's eyes the strands look a lot like the kinds of moss we get here in Sweden.
You're probably right. I still don't think it will cause any problems. I've seen growers use live moss in their orchid pots just as decoration. In nature orchid roots grow in and around moss, algae and fungus. In fact some types of fungus are beneficial to plants.