The 1" HDPE is on the way, and the rebuild is eminent, The Bio-beast is re-emerging from its long hiatus with a leaner, meaner and slightly arctic look to it. Only 5 plates per group this time, media blasted, bumping up to .120" plate gaps, and inverting the orientation of the plates to put the (now) 2 gas holes at the top, and the (now) single make-up hole at the bottom.

My plate groups, like Larry's, will be separated by divider plates that are separately drilled to serve the group on each side of it.
My Pos & Neg plates will alternate from group to group like this:
[]+-+-+[]-+-+-[]+-+-+[]-+-+-[]+-+-+[]-+-+-[]+-+-+[]

So, whatever plate, Pos or Neg that resides immediately next to a divider, is going to determine which reservoir that group draws water from. By alternating the polarity of the end plates from group to group it allows me to break any circuit that may be established through electrolyte, and also allows the use of only 2 reservoirs without current leakage concerns, I think... If anyone see's a reason why this will not be so, please clearly explain it to me so that I can alter my plans.