The Wikipedia page points to a classroom demonstration about building an ecosystem yourself. And has an offsite link as well. Maybe a high school or grammar school could build a shrimp and algal terrarium that lasts the entire school year or longer.
Twenty years ago, when these Ecospheres ™ appeared in the Edmund Scientific catalog, you could also purchase a light meter to measure the light dosage. When you hit the quota for the day, you were supposed to move it into the dark. The advert blurb in those days said that with proper light maintenance, the ecosphere would maintain for years. And that some evidence of life cycle for the shrimp. That means, they grow bigger, they lay eggs, smaller shrimp appear and grow, the ones that die soon disappear rather than accumulating. I suppose that counts as winning. Or is it lasting for years a minor win? But if you can have it recharged at any time, well, what;s the point?
The people I call crackpots are referenced in the Wikipedia article. They used to edit the article, and they sell this species of shrimp. They say there is no evidence of life cycle, the shrimp just starve, and become smaller, lose their color as they moult into a new shell, and aren’t young. So this ecosphere is a cruel invertebrate torture device. Like I said, I can’t prove that it works, so I can’t say they’re wrong. Just a little knee-jerking on my part for the invertebrate animal rights crowd. Not for the dubious science.