I thought about fixing it, but being that its on a seem and looks like a mold bubble, there may be more issues with the tank altogether. I was pretty cool with them on the phone, no empty threats or anything stupid.
I think garage builders like me are at a real disadvantage, dealers know we buy parts and sometimes it takes a while to get them on. Whats funny, I checked the companies web site for their warranty, they don't have one, its sold with no implied warranty. A well known company that doesn't back a product. Guess I should have looked first! Shame on me...