Oh, and I thought I'd mention. In the grand scheme of things. If you took a weekend to build a proper enclosure. You would probably actually end up being able to make money from selling the 125 gallon tank to a fish enthusiast and building a proper tank. I've seen several 125s sold for $200, and I can throw together a monitor enclosure (it won't look super pretty) for around $100 or less if I work at it.
Just sayin.