Hard water

[Wiggles24]

Hey guys what's the easiest most fish friendly(so I don't have to do a lot of cleanup after) way to remove some of the hard water stains in a tank? Want to set up my other 55 again but it has some serious stains

 

[GodFan]

Bleach or vinegar are good I have heard.

 

[butterfly_koi]

Vinegar, a razor blade, and a bit of elbow grease is the best way to remove hard water stains