WATCH: A koi fish aquarium built right into the steps of a HDB unit entryway
Live in an HDB flat with no space big enough for an actual pond to keep Koi fishes? A HDB dweller didn’t let the limited expanse of public housing stop him from building a koi pond at his doorstep. No, literally at his doorstep — the small stairway to a ground-level unit was successful converted...

https://coconuts.co/singapore/news/watch-koi-fish-aquarium-built-right-steps-hdb-unit-entryway/