Hi Zenith, I could show you some perfect looking vanda roots and I can show you some that look worse than yours. Vanda roots take a long time to grow their roots and they like to keep these roots for years. So over time it is very common for the roots to get covered in bird droppings, grow moss and algae on them. Very similar to tree branches exposed in the air. Go out into the forest and look at the bases of the trees. They should have a similar look to the roots on your orchid and I think they look like a well weathered vanda root should look like. I know it can be hard to judge in what state the root is actually in as it is essentially completely covered in algae and what you are seeing and worried about it just a covering of algae hiding the root underneath it. The roots do fine like this, I certainly don't clean any of mine. You can still judge how they are doing by how plump or shriveled they are and yours look fine to me. We can't see your leaves but the leaves are a great indicator of how much to water. If they become slightly wrinkly you need to increase the watering frequency but if the leaves have no signs of wrinkling and are plump then the roots are doing their job and should be in a good shape and getting enough water.
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