I know, I know, 'test it to see if it overflows'. But, how can I test it until I build it? So, I'm thinking 8 inch high baffles. The tank is 24 long, 12 wide, 12 high. That leaves 4 inches for overflow, which equates roughly to 4 gallons for overflow when power is cut off. I'll have a simple 1 inch drain from the overflow, and a 3/4 inch return, both approximately 3 to 3 and a half feet in length. This is going to be the sump for a 29 gallon display tank. Is 8 inches a safe height for the baffles in the sump? Any opinions would be greatly appreciated!