BeanAnimal overflow help

[ashr]

I ran a test last night and the sump held! The size of the sump is 26x26 cube with the height at 16" If it did start to over flow I have a 5 gallon side that fresh water will be held for my ATO. I will keep this about half full just for the reason of over flow but all seems good. I will do a test run again tonight just to make sure.

My returns are not pointed down but near the top so the back fill shouldnt be a ton..