Ya that is an accident waiting to happen in my opinion. I have seen seals like that (with air bubbles trapped) on a 125. It started leaking only 2 months after being installed. Your looks worse. Also the one pic appears to be just air trapped. The other pic looks as if it already has water channeling through the gaps. I would call them asap and get confirmation from them. If they say its fine I would record the name, date, and time you talked to someone. That way it is in your records if necessary. Also, as far as those round spacer discs are concerned, I don believe that is whats in there. If it is it shouldnt be. Those should be removed prior to sealing that spot. I def wouldnt add anymore water. Thats 500gallons * 8 punds a gallon. You have darn near 4000 pounds of water pushing out on those seems. Good luck man, let us know how it turns out. If I were you and they offer a replacement I would ask that they incur the charge of having a local tank service company do the swap out. There is no reason a tank should leave their shop regardless of if it will leak or not. When someone spends the kind of money you have obviously spent here (amazing woodwork btw), you have the right to expect perfection. Functional and cosmetic perfection both.