toilet tank turned brown suddenly

I've got an odd problem. A few weeks ago I started getting brown streaks down the side of the toilet bowl. We clean the bowl, the streaks come back immediately. Well today I looked in the tank and the inside of the tank is all brown / rust colored.

We have never had a rust problem with our water before.
We have other toilets which do NOT have this problem.
The toilet is used at least once a day.
There is no issue with the water at the sink in this bathroom.

Is there any parts inside the tank that would break down over time and have a problem like this? The toilet is about 5 years old. As of about 2 months ago, I tossed a bleach puck in the tank and it was not discolored at that time.

Thoughts on the cause or how to remedy??

About 2 months ago you put a corrosive chemical in your toilet tank. A couple/few weeks later, you started noticing rust stains in your toilet.

Coincidence?

Maybe. But probably not.

Those tank pucks will do nasty things to your terlit innards.

steve1544 said:

You should clean your toilet tank to avoid this problem. Thanks

Click to expand...

What should it be cleaned with? Obviously not bleach.