Hey guys, I'm fixing a 135 gal tank that had a leak at the front bottom seam. It has no bracing in the middle. So I'll be adding it. My question is, there is a gap about a sixteenth of an inch where the front bottom lines up with the bottom joint. Is this normal, or is it built wrong? One of my local LFS built it back in 1985. The guy I got it from had three giant rocks right in the center of the tank and about 250 pounds of gravel in it. He came home one day and it was empty! Without the bracing, I can understand why the seam split. What do you guys think? Heres a pic.