There are things that can be done to decrease the risk of the tank falling over.
1. use an oversized wooden stand. The more extra clearance around all edges the better, like 6inches extra beacause earthquakes cause lateral sheering forces. Try to build a pyramid structure. I think wood is better than steel because its flexible and would act like those springs under buildings.
2. as stated above a lip would restrict lateral movement, so would any plumbing under the tank. So multiple drains & return from under the tank at the corners straight down to the sump would help anchor the tank to the stand.
3. avoiding a canopy and sitting fixture, use a hanging fixture instead
4. as stated above, running with the DT volume as low as possible
5. securing CO2 gas tanks, reactors, lights, etc.
6. avoid plumbing going through walls. Try to keep the tank + stand as independent as possible. Allow it to wiggle a few feet sideways unimpeded.
7. I agree with using acrylic tanks- much stronger
8. GFCI outlets
Thats all i can think of...