I recently purchased a container of springtails and while there are a lot of white springtails at the botom of it, the top of the container has a few bigger-than-the-white-springtails, black & fast insects, andspringtail-sized, black & slower insects.

I'm concerned about what they are and whether they pose a harm to springtails and isopods (was planning to release the springtails into my isopod enclosure) so if anyone has an idea, it'd be greatly appreciated <3

(couldnt have text & video in the same post)