Tank question

[ty1on73]

I was given a standard 45 gal. tank (very used and scratched) that i am going to turn into a QT tank. The tank has alot of hardwater stains around the top w/ what appears to be calcium build up near the top.
Question: Does anyone have a suggestion as to remove this buildup without harming any future inhabitants?
Ty

 

[ty1on73]

I tried vinegar with no luck......I scraped alot off w/ a razor blade as well but this stuff is not natural....

 

[beaslbob]

Originally posted by ty1on73
I was given a standard 45 gal. tank (very used and scratched) that i am going to turn into a QT tank. The tank has alot of hardwater stains around the top w/ what appears to be calcium build up near the top.
Question: Does anyone have a suggestion as to remove this buildup without harming any future inhabitants?
Ty
I would start by using a 1/3 to 1/2 bleech solution and letting the tank soak overnight.

 

[bullshark]

Is it a glass tank? Scrape away with the razor blade...
Worked for me.