Hi,
I've built a few tanks (not a pro) but they worked!
if the glass is sharp (rough cut unfinished) you can use a Diamond file or Diamond Honing pad/stone to break the edge (not a break like a crack but a break edge chamfer)
The last build I made had a missing bit in the corner and it leaked so I applied what can only be called a generous helping of silicone, it fixed the leak but boy was it ugly!
i don't see why the panel cannot be rotated so the chipped corner is at the top, that's what I would do but it depends on how bad the corner looks, which way the vents run and if there is any heavy shelling in the panel. Given the weight it's a tough call. (Yes I have experience as a glazier)
photographic evidence,
The polish by
Nano Second Artist, on Flickr
(using files/stones)
After silicone
by
Nano Second Artist, on Flickr
(errrrm, the bodge!) red circles denote leaky bits!
the fix worked though.
Fish House MkII June 7th update by
Nano Second Artist, on Flickr
the only tanks I didn't make are the 3 in the back corner (one with lights on and the small 15g are manufactured)
the one in the corner top shelf is somebody else's DIY, but it was well made and CHEAP!
My first tank and build, as a glazier I sure wasn't gonna pay all that for some glass!
https://m.youtube.com/watch?v=3NRCMkV2sFc