Hi Dennis,
Before I start, i'd like to tell you that I LOVE YOUR TANK!!!!! I can not stress this enough man, you have/had an amazing tank and have been an inspiration to me for my next build.... which brings me to my question...
You know the pockets behind the overflow that cover the grates/grills (not the dry well for vortechs) - what is that for? Why do you need to cover the grills? And do the pockets extend all the way down to the bottom, or do they stop at the bottom level of the bottom grates?
Please shed some light on this as I am in the process of building a cube and am trying to replicate your tank inch by inch, as best as possible.
Thanks in advance - have a good one...