I do use perlite in my soil mix, but the sun is reflecting on the soil in a way that makes it look like there is much more in it. It's only about 20% perlite, at most. Sometimes watering makes the perlite float to the top from first inch of soil. But in person, I think the red clay kinda has a sheen that is adding to the look in the photo.Is that perlite mulch?