I ❤️ ponds, but live in a tiny London flat. So I made a ‘nano pond’ using just an @ikeauk lamp & fruit bowl. Complete with mini waterlily. pic.twitter.com/tTIhVuz2gQ— James Wong (@Botanygeek) October 29, 2017
Re: Your questions. The plants do all the cleaning, but I do keep the water topped up. It's too small for 🐸 or 🐟, but tiny🦐 would work!— James Wong (@Botanygeek) October 29, 2017
Here's his article about making your own.