Im not exactly sure what you are seeing as its too hard to tell from the pics but if you are using ewc and your soil is healthy you should and will see millions (probably not an exaggeration) of little white wigglies. They are part of the ewc process. EWC farms spawn a lot more than just ewc. It loads the soil with beneficial aerobic microbes of all kinds. Thats not to say that those aren't gnat larvae but if it is what I think it is then my worm farm is loaded, my ewc bulk bins of finished ewc are loaded, and every grow I have done has been loaded, yet I have never seen a fungus gnat in my tent. They are usually the 1st composter to show up. If you pick a couple leaves and toss them in a nice damp tote of ewc you will see what I mean, they are pretty much always 1st to the dinner table. They are called Springtails and you need them. Here is a google snippet on them.
"What Are Springtails?
These tiny little insects are springtails, or Collembola, and they’re usually found in areas with high moisture and decomposing organic debris, such as soil, leaf litter, and decaying vegetable matter. They can also be found in compost piles, mulch, beneath logs and rocks, and under potted plants.
They eat bacteria, fungi, lichens, moulds, algae and decaying plant matter, recycling them back into nutrients which fertilise the soil.
Typically, springtails are around 1-2 mm (1/25 – 1/12”) long, though the smallest ones are only 0.2 mm long, and are among the world’s smallest insects. They are usually are creamy-white, dark-coloured, brown, grey or black in colour. but some springtails species are brightly coloured, being red, orange, yellow, metallic green, or lavender in colour."