I'm assuming you are using a cross to drain the different parts of the viv. A simple straight piece of PVC stuck through your eggcrate should do fine. You can cut some notches on the bottom to allow water to flow through.
Seems like most false bottoms I've seen on here are 2-3 inches off the bottom.
Seems like most false bottoms I've seen on here are 2-3 inches off the bottom.