Hazy glass

[Reeferwab]

I am moving and just broke downd my 50 gallon cube which has been in operation for 5+ yrs. Cleaned up and notice there is a distinct haze line that goes all around the tank about 6" from what was water line all the way to bottom of tank. Never notice when water was in tank. But I was wondering what this could be and is there anything I can do to clear up the tanks glass. Looking at it you would think the tank stood dormant with water left at the level of the line, but the tanks has been in operation ever since I set it up. Very strange. Any thoughts?

 

[tzabor10]

Citric acid or vinegar are my go to cleaners

 

[Outlaw Corals]

Bleach works best and it is safe to use

 

[Reeferwab]

Citric acid or vinegar are my go to cleaners

White vinegar is what I have used in past. Great for breaking down Coraline and calcium. But isn't touching this haze. Kind of looks like water spots but again does not clean to a clear clean glass appearance.

 

[FUNGI]

most likely got etched by whatever (if anything) you dosed....