Originally Posted by Jaketit
I'm kinda worried about those wheels.
+1 on this. At 200 pounds each, it looks as though you used 4, so 800 pounds capacity. You're putting a 75 on it as the display, which is 600 pounds of water. You're using a 20L as the sump maybe halfway full, so there's another 80 pounds. The tanks themselves have mass as does the stand. By the time you're all said and done, I'm sure you're over 800 ponds.
Then you have to be concerned about weight distribution. The tank is meant to be supported all the way around the bottom rim, not just on the corners. If you just support it on the corners, it will want to sag in the middle, which I would be afraid would lead to a catastrophic tank failure.
It also induces a point load on the floor for an extended period of time.
I think there's a reason you never see tanks on wheels like that. You either need to add a heck of a lot more wheels or take the ones you have off.