Tank not leveled, leaking water

My Red Sea Max S650 (150gal) was not set up perfectly level but it has been fine since I got it 3 years ago, and I was assured it wouldn’t be a problem according the the LFS I bought it from and who set it up. However this week it seems to be tilting more, so that even though the water height is set correctly, water is covering the entire glass lip along the front of the tank and dripping down the outside glass. I’m at a loss of what to do. This thing took 4 guys to carry it into the house when it was new and completely empty. The only solution I can see is to somehow transfer everything...water, rocks, coral, fish...to another tank, adjust the level, then refill. That sounds absolutely awful, as well as risky to all the tank inhabitants. Thoughts??

What else would you be checking? I was really worried because it is on a wood floor but I put the level on it and it is ok.

There's no areas that are obviously wet that I can see.  I know the base has gotten wet with water changes etc but I try to dry everything off as much as I can afterwards. How to further investigate? That's where I can't think of anything but emptying the tank and removing it from the stand.  How to even go about that???

Well, in discussing this with more people, I was advised to clean my outflows, which I did as well as my surface skimmer and it made all the difference, and my water levels dropped. Of course it turns out to be something simple. But I still plan on getting some assistance in getting this thing checked out and leveled ASAP. Yeah, in hindsight, I wish I was more savvy when I got the tank set up but as a newbie I was clueless. I would have done a lot differently.