My dad and I made this fishtank for my mum for Christmas a few years ago with dollhouse furniture. I thought it was pretty rad
That is all different kinds of awesome
This is very cool but, as the OP says in a later edit and follow up answers to asks, not recommended for anyone who doesn’t know what they’re doing with fishtanks. Making sure all that dollhouse stuff is aquarium-safe was probably a huge pain and there’s no gravel to help maintain the beneficial bacteria that keeps the tank’s ammonia levels down (and thus the fish alive).
Also, it doesn’t look as though the fish have anywhere to hide, but I’ve never kept goldfish, so maybe that’s not as important for them as for other species.
Anyway, the OP obviously does know what they’re doing and I’m not knocking, just adding/compiling additional info.