That's a very, very bad way of thinking when keeping live animals.
For example, clown loaches live 20+ years. It's not growing because it's in a tank which is way too small for it, and it's a shoaling fish, too. So pretty much everything is wrong for it. Fishes live for years, so if you don't expect them to live long, they have died due bad fish keeping.
Also, all that fake stuff is not to my liking.
Rehome those fish, please, and have something smaller, like something nice, colourful tetras.