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Light, helped with excess fertilizer, encourages algae. Quite harmless, just not attractive. Putting clear pot into a decorative pot will solve two problems:
1. Will reduce the light, so reduce the algae
2. You won't have to look at it.
Orchids in nature, with lots of moisture and sunlight, have lots of algae... no problem. It's not something to treat... reduce it by modifying your conditions, and then accept it as part of nature. And no peroxide anywhere near the roots! It damages the little root hairs of the growing tips.
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