I have something similar to this in my bathroom but bigger, it's a glass tank about a meter long, about 20cm high and wide, has plants either side with water in the middle. so its kind of like a slice of a river bank. has peace lily one side and a spider plant the other. various other things have started growing in there too.
I just keep it topped up with water and let it go wild. has been going for a few years now and pretty healthy, despite periods of forgetting to top the water up.
the idea was to have a large wabi kusa set up. but it kind of changed a little.
i'll take a photo when I'm next home in the day light.