Four year old closed ecosystem!

This is my closed ecosystem I started in 2022, from a creek near my home. In its early days I remember it had these small, skinny red worms living in it that I thought were pretty neat. I was showing and explaining it to my (now ex) friend and this jerk went and popped it opened all willy nilly to take a closer look! Who even does that? Four years later and I still hold a grudge. The little red worms all died shortly after, probably for unrelated reasons. I've been thinking about starting over for a few years now but I always miss that window of time where the creek isn't too dry.

Anyways I was looking at it close for the first time in a few months and there are what I think are little teeny water fleas! It's impossible to get a good picture of them but they have teeny heads and round bodies and move by jerking around. I'm so pleased that theres still (animal) life in here after all this time. And that plant is doing well, too! This thing lives on my windowsill and I think it's great.