I'm going to repost in this forum for more exposure.
For some background, please check this DIY thread: Did something stupid - Removed braces
Basically, I just implemented a DIY bracing solution to replace the semi-Euro-braces that were originally in place (partial longitudinal strips of glass siliconed at a 90 degree angle). The aluminum bracing you see is what I added to replace the glass bracing.
On the upper left of the tank, near the left edge of one of the braces, I noticed this:
I can feel it with my fingernail, I can get my nail to hook itself into it, but only on the outside. On the inside it can't be felt. The way it reflects light makes me think it's worse than just a scratch, but a hairline crack that is forming due to a badly designed brace on my part. It could also be a scratch that I accidentally made sometime during the last days when I've been working on the braces. What do you guys think? From a structural point of view, is that a likely place where a crack might form, looking at the way I've attached the braces?
The whole bracing job can be seen here: