Anyone know what these tiny white bugs are?
 

They float to the surface of the bark medium. Some look like husks, but some walk around.https://uploads.tapatalk-cdn.com/201...a51970d1ba.jpg


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The photo isn't clear enough to show the detail necessary identify them. It is a challenge to photograph something so small without specialized equipment. From a vague sense of the shape and size, and the description that they float to the surface, my first guess would be springtails. Perhaps if you can search for a photo of white springtails you can see enough detail by eye to make a match. Springtails do not all look alike so you may have to look at more than a few pictures to find a match.

You may look here, perhaps you'll find them.