I'm hoping to learn something here. I have a 125 with a brace and the brace is so gunked up, light doesn't hardly penetrate. I hate that and don't know what to try except taking it off and replacing it. I would love to buy another tank and buff this one top to bottom since there are scratches but I don't have that kind of budget. If there is a hard work solution, I'm down. Else, could I just cut the silicone on it and take the centerbrace out? Maybe that would be bad since it was built like that? Maybe it's not a problem since this thread is about a 135 with no brace that has the same thickness glass? I have heard that some glass is produced to a certain caliber and can only withstand so much pressure and higher caliber glass would withstand more pressure. Not much more, but a little more. I'd like to find out for sure so I can get light to the middle of my tank. It's been a great hiding spot for as long as I can remember. I bought this tank used and leaking once upon a time and assumed I could take whatever discoloration off with typical scrubbing. Mistakes were made. Subscribed.