Stubborn stain on glass, removal tips?

[bpalmer94]

hello all,

As the title says ive got some stubborn stains on the 90gal bowfront I am setting up- my first saltwater tank. Ive tried scrubbing it with hot water, an aquarium safe cleaner, razor blade, i even tried to use some 91% rubbing alcohol in a small spot but nothing is working. it almost looks like a stain from mold? Anyone ever experience something similar or have suggestions for removal? Hard to get a good picture of it

Any input is appreciated

 

[FUNGI]

Try vinegar....

 

[TheFunnyFarm]

Citric acid, and if all else fails diluted Muriatic acid.

Is it a used tank? I’ve learned that kalk can etch the glass.

 

[bpalmer94]

Yes its used, ill give vinegar a shot and if that doesnt work ill step up to something stronger

 

[FUNGI]

Citric acid, and if all else fails diluted Muriatic acid.

Is it a used tank? I’ve learned that kalk can etch the glass.

True....but (I assume) it looks like its on the outside....just saying....

 

[bpalmer94]

It seems to be on the inside to me

 

[FUNGI]

If its on inside, then OP has issues with his seams also.....

 

[bpalmer94]

Yes that is also on the list to do, free stuff always turns into a project!

 

[Sump Crab]

Is it low iron glass? Low iron glass can get a hazy look if installed inside out from the factory. As far as I know it's permanent and can spread.

 

[The_Paradox]

Looks like coralline etching to me. If that’s the case only option is to polish it.

 

[bpalmer94]

Is there an aquarium specific polish? Or are there certain types of polish to stay away from for aquarium use?

 

[The_Paradox]

Go to is usually cerium oxide. Depending how bad it is it is sometimes quicker to work 1000-2000 grit paper then hop to polisher with cerium oxide.

 

[gbroadbridge]

hello all,

As the title says ive got some stubborn stains on the 90gal bowfront I am setting up- my first saltwater tank. Ive tried scrubbing it with hot water, an aquarium safe cleaner, razor blade, i even tried to use some 91% rubbing alcohol in a small spot but nothing is working. it almost looks like a stain from mold? Anyone ever experience something similar or have suggestions for removal? Hard to get a good picture of it

Any input is appreciated

Muriatic Acid

 

[jordangdoee]

Update what worked best?