Originally Posted by George9
Could the outside glass just be dirty and need some windex?
I wouldn't put windex anywhere near my tanks
I use an API spray that cleans the outside of tanks and is completely safe
I've also head of people using a vinegar solution? Not too sure on the vinegar solution though...
Sorry for the dumb question, but it in on the inside of the tank? Could it be some hardwater stains? I'm not sure if it's called hardwater lol but they're like mineral deposits on the top of the glass.