I have just noticed some very small silvery bugs in the soil of my calamondin tree. I haven't been noticing any flying insects from the soil just these little crawling bugs that look alot like thrips, but smaller and silvery. I haven't seen any on the tree itself, just the soil. I also noticed in my bag of unused soil tiny little worms. They are whitish and opaque, not even a centimetre long. There are many of them, and they're all very small. This is the soil I used to repot my calamondin four months ago, But it didn't seem to hurt the tree. I have however noticed that it stopped growing. It seems healthy,but new leaf sprouts seem to be dying off as soon as they pop out. What might these bug be? Should I worry?