Leveling an 80g on an incredibly uneven floor
SO here is my situation
80g tank with a stand, its about 4ftx1.5ft
I live in an old firehouse and my living room used to be one of the garages, the floor is concrete but all of the floor is depressed towards the center, where there is a drain. The drop tapers off as you get closer to the drain, the foot of perimeter closest to the wall is the most extreme, meaning if you set the stand where I would like it to be, which is perpendicular to the wall, about 6 inches away from it, its not only not level, but there is also a huge gap between the ends, due to the change in slope. So not only would the tank not be level, I would think the stand would warp and likely fail.
Where I would like to put the tank, the floor drops over 1 1/4 inches over the 4 ft, so its pretty bad. It is too much to shim and the floor is so wildly uneven due to scratches, pits and general abuse (they worked on the fire engines in here, so imagine the horrors this floor has seen) that Im thinking the best solution is to use concrete to build a leveled slab that will mesh with the unevenness of the floor.
I cant actually lay the concrete directly on the floor as its a historical building and I can't permanently modify it, but I can put down a tarp or something, build a frame and then lay the concrete inside that frame on top of the tarp, so if it ever needs to be moved the concrete wont actually be attached to the floor.
It wouldn't be too expensive, it wouldn't exceed more than 25 bucks for the concrete and I have access to wood to build a mold out of, which I would level and then line with the tarp and then fill with the concrete. It seems like a solid idea.
I have tried making 4x4 wooden feet that are cut to make up the difference in height, and then shimming them to make them level and it was an utter nightmare due to the unevenness of the floor and the miter saw I am using is less than fantastic, so the cuts were slightly angled making matters even worse.
What do you guys think, keep trying the 4x4 legs and just shim until its finally level (I got level doing this but it involved so much correction with the shims that I just didnt feel safe about it) or give the concrete a shot?