Cleaning up disk space used by Nix - Nix

I'm looking at what all is using space on my machine rn, and noticing that nix is taking 22 gb; i suspect that there is some stuff in there that could be cleaned up

any advice on how to go about handling this?

i'm running nix optimise-store rn

Have you done nix-collect-carbage? (with appropriate options)

sudo nix-collect-garbage --delete-older-than 7d

1TB is the recommended disk space on a developer laptop running NixOS for this reason. :-)

Oh, and also nix-du might be useful

thank you, these helped.