You'd want to increase the number of "pegs" so that you didn't put too much pressure on just 8 with a tank that big, but I don't really see why it wouldn't work on that scale. I didn't get any pictures yesterday, but I'll get some this afternoon. Until then, here's a really bad ASCII drawing of it...
________________________________
bottom of stand / \
_____________| |________________
| | <--- screw
[===] <--- bolt
==| |== <--- washer
====| |==== <--- bigger washer (which I'm only using because I drilled my holes too big)
___________ |__| _____________
| |
|________| <--- hole drilled into "foot"
bottom "foot"
_________________________________
It's basically just a regular leveling foot, except all the "foot parts" are connected into one big rectangle at the bottom so its not pinpointing the pressure on my floor.
EDIT: Oh geeze, it formatted my post really bad. I'll just take a picture when I go home.