posible cheep alternate stocking tank??? 4 tanks one canister filter

as far as the water overflowing you make the dividers sligltly lower than the tank. if you have over flow o well it will go over to the other dividers. no problem there. as far as kinks i see none. the pic above is the comparison of how much wasted space there is with 20 longs. and what will be dificult about maintaing the 125 with dividers??? it would be like maintaining 6 20 gallons.

I think dun was referring to the original drawing with hinged, horizontal compartments.
 
This isnt exactly a good comparison. You dont take into account front to back space.

If you turn the 20 gallons sideways, you can fit a lot more per shelf.

No input for your tank design though.

it is alot harder and take alot more time to fined that many 20 longs to fill the space than it would be to fined the 2 125's used. could try drawing them up sidewase and see what happens. I still think 125's will be the better option as far as head space being wasted and money saved on building stands and money save on pipe and sump and so on and so forth.
 
that is what was stated. the inserst will have spounges in them. check out this post for what i will be using. by the way i have these spounges in all my tanks now. they requier weekly cleaning but filter extreamly well. http://www.aquariacentral.com/forums/showthread.php?t=223376
I see

was thinking even simpler but very effective

air driven sponge filters

like this

http://www.aquariumguys.com/aquarium-sponge-filters.html


one for each section divide the 125 into separate sections
 
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