Cleaning a tank

[Printerhands]

So my gf has this tank that I will be using. It has sat empty for 3 years and has some good calcium build up on it. What is the best way to clean besides some good elbow grease? I hear I can use bleach.

 

[Rare]

Vinegar! I used 5 gallon no water first to let the bottom section get the full dose. I then filled it up with water a few hrs later and ran it through the system till the day. Most came off & the other hlaf was easy to remove cause it was soft after the next day.


Last week I got this 125g

Right now as Im taking out the water cause I need to do some work- paint the back glass..etc,...

 

[Fishanatic]

True, you can use vinegar or you can also use a 1/9 bleach solution and thoroughly rinse afterword.