Is it common for OUTSIDE of seams to start turning white?

My acrylic tank seams are starting to show signs of wear. But it's not where I would have thought, it's not on the inside where the water meets the acrylic, it's on the outside edges, where the two pieces of acrylic meet on the outside of the tank. I would have thought it would have been the other way. Anyone ever seen this or is this always how it goes? How much time would your best guess be from when this starts(how fast does it spread)? Most important, will reinforcement of the seam using weld-on#40 help this when doing it on the inside? Thanks.






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Amazing link, thank you. I feel like what is compounding the problem is my tank isn't 100% level. I got it the best I could at the time, I definitely took the time to do it, but I was moving my fish and whole aquarium from one house to another in the middle of winter. No excuses though, I wonder if it is possible to shim it while it is full? Talking probably 4500 lbs, as much as 5000 maybe, anyone have an idea how to shim that to help elleviate some pressure before I take it down and repair it?

I figured that, one can dream though. Not an expert, logic tells me the same thing you said, but sometimes people come up with amazing solutions to complicated things. Well I'll be taking it down to put some weld-on on the seams in about a month and a half, I'll just make sure it's level then.