aquarium discussion

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.

Am i the only person who’s angelfish handfeeds and chases my finger across the glass after 3 weeks of keeping them

I was just wondering why piranhas are illegal is states like Texas and California. In a warmer and more hospitable environment like south Florida, there are no breeding populations of piranhas. The closest thing they have in south Florida to piranhas is pacus, and even those aren't very...