Well, I've gotten a lot of help so far and all of the various information sources tend to agree with each other except on this one point. Some give advice that, considering I'm doing a 125g tank I should take the tank completely apart separating the glass panels and top and bottom plastic frame pieces, remove all the silicone, and then rebuild it from scratch. While other advice is to scrape all silicone from the inside of the tank that I can get to making sure not to let the razor slip between the glass panels to compromise that silicone, and then clean and re silicone the inside.
So which advice should I take? Would it be ok to just do it the simpler way, or is breaking the tank all the way down entirely necessary?