Long story short I bought a brand new acrylic 8ft. tank last fall. I filled it up and got it really running sometime in October. Around December to my horror I started to notice small fleck marks across the front pain. (Exactly the same issue as my old 300 had happen--which I attributed to the age of the tank and all of the expanding contracting of a used tank) These aren't scratches on the inside or outside but rather imperfections in the acrylic. It makes the fish look like they're in 3-D when they swim past. This continued to get worse and I found myself in the horrible position of taking the tank down. Luckily it's under warranty and the manufacturer has been very good about communication. I sent them a video of the issue and after a couple of discussions they kept their guarantee and built me a new tank. I just learned that it's been built and is en route to me. So now comes the fun part of taking the current take down, hundreds of pounds of rocks, sand, re-homing fish etc. Total drag but I am thankful that the new one is on its way and keeping my fingers crossed that it holds up this time.
*Has anyone ever seen an acrylic tank do this? It's not the normal "crazing" around the seems its across the front glass.
**Also my wife and kids have told me that they want me to put BIG fish in the new tank like I used to have, because Africans are boring. (I thought Blair would get a kick out of this.)