I have a acrylic tank with a wide lip on the top , had a hard time acclimating and hanging a specimen containers while working in the tank . I guess hanging a fuge and other hang on's be a chore as well.
BONUS ENTRY #1: I love the Octo Pen! What a great product. Ya Tupperware is cheap and easy, but so ugly! Honorable mention goes to the Octo Strong Magnet Pods. I can't even put into words how valuable a set of waterproof magnets are! I can't believe more companies don't offer them. Kudos to you for the idea!