Lightweight structural building material
What is a good, lightweight structural material for use in a tank that won't affect tank parameters?
I what to build up an area in a tank to support seiryu stone but don't want to use seiryu for the entire structure b/c of 1) weight, and 2) want to minimize the amount of seiryu stone to minimize it's effect on tank parameters.
Is styrofoam OK? Lava rock is inert and presumably lighter than seiryu, but still seems like that doesn't adequate address my desire to minimize weight.
Thanks in advance.
There was only one catch and that was Catch-22.