Betta Fish: My betta’s pets?

A few weeks ago I moved some of my plants/bladder snails too a new, bigger, tank to start cycling the water for my betta's future move.

ADHD took over and I never finished the job. Tank is 1/3 full and I only installed the light… No filter. But my plants, snails, and water quality have stayed healthy. So I'm pretty surprised to have such an effective ecosystem out of "just" one type of snail and one type of plant.

Today I decided to look at one of the frogbit leaves that was dying, as is normal. I have a tiny handheld microscope and looked under and this is what I saw.

Microlife is so cool!

Those are water mites and I'm guessing the clear worm is detritus… Can anyone confirm? Also, at the beginning of the video there is a small clear thing moving fast near the worm. The video doesn't focus on it… Does any one know what it could be?

I'm not worried, just curious and my inner nerd is quite excited.

Zoom is at 60x and keeping a tiny plastic microscope stable PLUS the phone camera stable was almost impossible, so pardon the shaky movement and low quality video.