aquarium channels

Hi, I just bought my first acrylic aquarium and noticed something in the picture I captured. My question is: does this indicate a potentially weak structure in the aquarium? I dont care about how it looks.

Joey King of DYI, was the first aquarium related YouTuber to reach 1,000,000 subscribers, quite a milestone love/hate him. He currently has about 1.2 million subs. Paul Cuffaro, who is much younger and started quite a bit later, has now skyrocketed to 1.1 millions subs (even if quite a few more...