hazy glass

[Fin-Addict]

On one of our custom tanks the glass has a white haze over it, its now calcium deposit and we can't figure it out. We've tried scrapers and razors to clean it up but cant seem to figure out anything that works. The glass is pretty old so maybe that has something to do with it, we're not sure so if anyone has an idea we're all ears.

[hobogato]

try CLR, just make sure you wash the tank excessively before using it. that worked on some old tanks i put in my classroom.

[Fin-Addict]

The tank is already filled with water and running...

[hobogato]

doh. well dont use CLR then! sorry.