boken line in rocks
 

I'm getting a vertical line in the front rocks to the bottom right of the cave. anyone else see this?

After shrinking the screen so I could see most of the aquarium at one time, I noticed this line appear in more spots. 6 total.

Those are the seams in the textures. Some cards don't glue them together properly. Whether they show up or not depends on several factors including resolution and antialising settings.