Sorry, I don't peruse the forum, but your title caught my attention. Our 300 gal tank has been up and running for over 1 1/2 years. No bowing. Can't remember any significant bubbles in the seams, but will check the seams tomorrow in daylight. If there are any, they are very fine. We do not have a canopy, and have three lids--large pieces of acrylic--that are beginning to warp. Someone suggested that we turn them over. We haven't tried that. All in all, we are very pleased with our tank...it does come with a lifetime warranty. Would purchase another one from them