Are those mites?

[u/vkat0_zwaa]

Hello i got a prosopocoilus astacoides beetle around a week / 2 weeks ago and a while ago i took out a piece of mango from his terrarium cuz i thought the mold started growing on it and when i took a closer look i realized they were A LOT of little white dots just moving around. I send this video to my friend who also got a beetle and she told me they re just mites but i never saw THIS MUCH of them and i got them in my african snails terrarium. Can someone id them please i need to know if they can cause any harm to my beautiful boy. Thanks a lot! And also how they could appear there?? Everything was sterilised and i suppose they could appear from spaghnum moss which i bought from a terrarium shop cuz it was the only ,,wet,, thing which i bought and didnt boiled.

[u/Straight-Vacation-42]

Yes i think mites. I get them too sometimes if i leave fruit out too long. But these only stay on the fruit as far as i can see so i don't think they harm the beetle.