Not an animal but what is it?!

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What is this scum stuff?! I cannot get rid of it. I tried lime away, vinegar, razor blade, plain water, light grit sandpaper, scrubbing bubbles... nothing gets rid of it. Any help would make me a much less stressed person LOL. Thanks!

 

What/where is it on?

 

The glass center brace and top "ring" below the frames silicon.

 

So do you mean the glass is above the water level and not submerged?

If so, I would say it is just what happens when salt, oxygen, and glass mix. For this exact reason it is preferable to just have an open top with saltwater. I know this doesn't help you because you can't just remove the glass if I understand you correctly. I'm sure there is some kind of solution you can purchase that will clear up the glass but I have no experience with applying that kind of stuff to an aquarium.

 

Try jeweler's polish and a lot of elbow grease

 

Yes above the water line. I will try the polish thanks!!!!

 

So.. jewelry polish worked, kinda. It removed some of it, and after 35 minutes of scrubbing a 3" circle with no more results I realized it probably wasn't worth the effort. Any downside to leaving it?