This is in my GTP enclosure. There is a layer of pebble, then a few inches of organic soil, a little layer of moss and some leaf litter. I have springtails, doodlebugs <-- just added those about a week ago and some earthworms. I don't have any live plants in there.
The enclosure is a year old. A month or so ago these white spots started showing up and I don't know what they are. They are all under the soil, from just under to all the way down to the pebble level. They are mostly in the corners but there are a few spots in the center all the way around. Any idea on what this is?