A question about my stand...

[MikeP]

The stand for my 190g is a metal stand that supports the perimeter of the tank. The top part of the stand is 1.5x1.5 angle (when the tank is on it sits in the angle). I plan to put a piece of 3/4 in plywood and a piece of 3/4 styrofoam under the tank. Is the stand safe? This is the stand that the tank was on for years in the past but there will be a lot more wieght in the tank this time i.e. rock and sand.

Thanks for any input