i used to have common carp in an 8000 litre setup in an polytunnel. got divorced and lost the house. now just got a 540 litre system in my spare room. powered by 3 goldfish. been running it for years, never had to clean it once. got a palm tree (yukka thing) and a massive fern in it atm. they grow like fuck. only input is fishfood.  funnily enough, one of my first posts on here was building a workers from a bathtub for fishfood years ago.
United Kingdom