I bet they're are Springtails from your description.
Spring tails are completely harmless to your monitor and extremely common in substrates with decent humidity.
They are light in color, and they're abdomen is much larger than their head and also jump. It's actually pretty impressive to see them jump or spring hence the name. Google Springtails and you'll find pictures and some cool super macro videos of them springing if you're interested.

No reason to get rid of them. The reason why you saw them again when you switched substrates is they came in with the new substrate. But again they're completely harmless to your monitor and I'd rather have Springtails then any chemicals you might use to get rid of them.
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Charles Koutris

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